Effect on total amino acids level in Sogatella furcifera-sensitive Oryza sativa (rice) plant ARC6248 leaf blade measured per gram of dry weight at 0.100% concentration (Rvb = 3.54 mg/g fresh wt)
|
Oryza sativa
|
3.31
mg
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Effect on total amino acids level in Sogatella furcifera-resistanct Oryza sativa (rice) plant PR116 leaf blade measured per gram of dry weight at 0.100% concentration (Rvb = 3.91 mg/g fresh wt)
|
Oryza sativa
|
3.38
mg
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Effect on total protein level in Sogatella furcifera-sensitive Oryza sativa (rice) plant ARC6248 leaf blade measured per gram of dry weight at 0.100% concentration (Rvb = 17.67 mg/g fresh wt)
|
Oryza sativa
|
16.56
mg
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Effect on total protein level in Sogatella furcifera-resistanct Oryza sativa (rice) plant PR116 leaf blade measured per gram of dry weight at 0.100% concentration (Rvb = 21.67 mg/g fresh wt)
|
Oryza sativa
|
18.33
mg
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Effect on total phenols level in Sogatella furcifera-sensitive Oryza sativa (rice) plant ARC6248 leaf blade measured per gram of dry weight at 0.100% concentration (Rvb = 17.08 mg/g dry wt)
|
Oryza sativa
|
21.75
mg
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Effect on total phenols level in Sogatella furcifera-resistanct Oryza sativa (rice) plant PR116 leaf blade measured per gram of dry weight at 0.100% concentration (Rvb = 8.08 mg/g dry wt)
|
Oryza sativa
|
10.0
mg
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Effect on reducing sugar level in Sogatella furcifera-sensitive Oryza sativa (rice) plant ARC6248 leaf blade measured per gram of dry weight at 0.100% concentration (Rvb = 8.37 mg/g dry wt)
|
Oryza sativa
|
7.94
mg
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Effect on reducing sugar level in Sogatella furcifera-resistanct Oryza sativa (rice) plant PR116 leaf blade measured per gram of dry weight at 0.100% concentration (Rvb = 9.35 mg/g dry wt)
|
Oryza sativa
|
8.26
mg
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Effect on total sugar level in Sogatella furcifera-sensitive Oryza sativa (rice) plant ARC6248 leaf blade measured per gram of dry weight at 0.100% concentration (Rvb = 34.05 mg/g dry wt)
|
Oryza sativa
|
34.55
mg
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Effect on total sugar level in Sogatella furcifera-resistanct Oryza sativa (rice) plant PR116 leaf blade measured per gram of dry weight at 0.100% concentration (Rvb = 36.16 mg/g dry wt)
|
Oryza sativa
|
34.02
mg
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Effect on total amino acids level in Sogatella furcifera-sensitive Oryza sativa (rice) plant ARC6248 leaf sheath measured per gram of dry weight at 0.100% concentration (Rvb = 2.11 mg/g fresh wt)
|
Oryza sativa
|
2.46
mg
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Effect on total amino acids level in Sogatella furcifera-resistanct Oryza sativa (rice) plant PR116 leaf sheath measured per gram of dry weight at 0.100% concentration (Rvb = 2.58 mg/g fresh wt)
|
Oryza sativa
|
2.4
mg
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Effect on total protein level in Sogatella furcifera-sensitive Oryza sativa (rice) plant ARC6248 leaf sheath measured per gram of dry weight at 0.100% concentration (Rvb = 6.11 mg/g fresh wt)
|
Oryza sativa
|
5.0
mg
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Effect on total protein level in Sogatella furcifera-resistanct Oryza sativa (rice) plant PR116 leaf sheath measured per gram of dry weight at 0.100% concentration (Rvb = 7.06 mg/g fresh wt)
|
Oryza sativa
|
7.78
mg
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Insecticidal activity against L3 to L4 larvae of Diparopsis watersi assessed as mortality after 48 hr by leaf disc assay
|
Diparopsis watersi
|
82.8
%
|
|
Journal : Crop Protection
Year : 2009
Volume : 28
Issue : 5
First Page : 401
Last Page : 406
Insecticidal activity against Helicoverpa armigera assessed as time above which insecticide kills less than 50% of larvae by measuring index of persistence in presence of 24 mm of simulated rain applied at three days interval
|
Helicoverpa armigera
|
5.2
day
|
|
Journal : Crop Protection
Year : 2009
Volume : 28
Issue : 5
First Page : 401
Last Page : 406
Insecticidal activity against Helicoverpa armigera assessed as time above which insecticide kills less than 50% of larvae by measuring index of persistence under in absence of rain
|
Helicoverpa armigera
|
8.7
day
|
|
Journal : Crop Protection
Year : 2009
Volume : 28
Issue : 5
First Page : 401
Last Page : 406
Insecticidal activity against L5 larvae of Helicoverpa armigera assessed as mortality after 48 hr by leaf disk assay
|
Helicoverpa armigera
|
92.5
%
|
|
Journal : Crop Protection
Year : 2009
Volume : 28
Issue : 5
First Page : 401
Last Page : 406
Insecticidal activity against L4 larvae of Helicoverpa armigera assessed as mortality after 48 hr by leaf disk assay
|
Helicoverpa armigera
|
89.5
%
|
|
Journal : Crop Protection
Year : 2009
Volume : 28
Issue : 5
First Page : 401
Last Page : 406
Insecticidal activity against L3 larvae of Helicoverpa armigera assessed as mortality after 48 hr by leaf disk assay
|
Helicoverpa armigera
|
94.1
%
|
|
Journal : Crop Protection
Year : 2009
Volume : 28
Issue : 5
First Page : 401
Last Page : 406
Insecticidal activity against L2 larvae of Helicoverpa armigera assessed as mortality after 48 hr by leaf disk assay
|
Helicoverpa armigera
|
91.5
%
|
|
Journal : Crop Protection
Year : 2009
Volume : 28
Issue : 5
First Page : 401
Last Page : 406
Insecticidal activity against L1 larvae of Helicoverpa armigera assessed as mortality after 48 hr by leaf disk assay
|
Helicoverpa armigera
|
93.3
%
|
|
Journal : Crop Protection
Year : 2009
Volume : 28
Issue : 5
First Page : 401
Last Page : 406
Insecticidal activity against L3 to L4 larvae of Earias spp. assessed as mortality after 48 hr by leaf disk assay
|
Earias
|
99.4
%
|
|
Journal : Crop Protection
Year : 2009
Volume : 28
Issue : 5
First Page : 401
Last Page : 406
Insecticidal activity against Sogatella furcifera on insect-sensitive rice plant ARC6248 assessed as nymphal duration at 0.100% concentration (Rvb = 14.48 days)
|
Sogatella furcifera
|
14.5
day
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Insecticidal activity against Sogatella furcifera on insect-resistanct rice plant PR116 assessed as nymphal duration at 0.100% concentration (Rvb = 11.75 days)
|
Sogatella furcifera
|
12.0
day
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Insecticidal activity against Sogatella furcifera on insect-sensitive rice plant ARC6248 assessed as resurgence ratio at 0.100% concentration
|
Sogatella furcifera
|
1.0
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Insecticidal activity against Sogatella furcifera on insect-resistanct rice plant PR116 assessed as resurgence ratio at 0.100% concentration
|
Sogatella furcifera
|
1.0
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Insecticidal activity against Sogatella furcifera on insect-sensitive rice plant ARC6248 assessed as reproduction at 0.100% concentration
|
Sogatella furcifera
|
None
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Insecticidal activity against Sogatella furcifera on insect-resistanct rice plant PR116 assessed as hopper population at 0.100% concentration
|
Sogatella furcifera
|
None
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Effect on total phenols level in Sogatella furcifera-sensitive Oryza sativa (rice) plant ARC6248 leaf sheath measured per gram of dry weight at 0.100% concentration (Rvb = 12.75 mg/g dry wt)
|
Oryza sativa
|
17.08
mg
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Effect on total phenols level in Sogatella furcifera-resistanct Oryza sativa (rice) plant PR116 leaf sheath measured per gram of dry weight at 0.100% concentration (Rvb = 5.75 mg/g dry wt)
|
Oryza sativa
|
7.83
mg
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Effect on reducing sugar level in Sogatella furcifera-sensitive Oryza sativa (rice) plant ARC6248 leaf sheath measured per gram of dry weight at 0.100% concentration (Rvb = 6.41 mg/g dry wt)
|
Oryza sativa
|
5.98
mg
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Effect on reducing sugar level in Sogatella furcifera-resistanct Oryza sativa (rice) plant PR116 leaf sheath measured per gram of dry weight at 0.100% concentration (Rvb = 7.50 mg/g dry wt)
|
Oryza sativa
|
7.17
mg
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Effect on total sugar level in Sogatella furcifera-sensitive Oryza sativa (rice) plant ARC6248 leaf sheath measured per gram of dry weight at 0.100% concentration (Rvb = 25.98 mg/g dry wt)
|
Oryza sativa
|
30.0
mg
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Effect on total sugar level in Sogatella furcifera-resistanct Oryza sativa (rice) plant PR116 leaf sheath measured per gram of dry weight at 0.100% concentration (Rvb = 30.27 mg/g dry wt)
|
Oryza sativa
|
28.12
mg
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Insecticidal activity against Sogatella furcifera on insect-sensitive rice plant ARC6248 assessed as growth index at 0.100% concentration (Rvb = 2.38%)
|
Sogatella furcifera
|
2.24
%
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Insecticidal activity against Sogatella furcifera on insect-resistanct rice plant PR116 assessed as growth index at 0.100% concentration (Rvb = 6.02%)
|
Sogatella furcifera
|
5.66
%
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Insecticidal activity against Sogatella furcifera on insect-sensitive rice plant ARC6248 assessed as nymphal survival at 0.100% concentration (Rvb = 34.17%)
|
Sogatella furcifera
|
32.22
%
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Insecticidal activity against Sogatella furcifera on insect-resistanct rice plant PR116 assessed as nymphal survival at 0.100% concentration (Rvb = 70.28%)
|
Sogatella furcifera
|
67.5
%
|
|
Journal : Crop Protection
Year : 2011
Volume : 30
Issue : 2
First Page : 118
Last Page : 124
Resistance factor, ratio of LD50 for fourth-instar larval stage of Helicoverpa armigera field strain Gaschiga isolated from tomato plant to LD50 for fourth-instar larval stage of pyrethroid-susceptible Helicoverpa armigera laboratory strain BK-77
|
Helicoverpa armigera
|
0.7
|
|
Journal : Pest Manag Sci
Title : Esterase-mediated resistance to pyrethroids in field populations of Helicoverpa armigera (Lepidoptera: Noctuidae) from Central Africa.
Year : 2009
Volume : 65
Issue : 10
First Page : 1147
Last Page : 1154
Authors : Achaleke J, Martin T, Ghogomu RT, Vaissayre M, Brévault T.
Abstract : BACKGROUND: Evolution of pyrethroid resistance in the cotton bollworm Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) threatens continued cotton production in Central Africa. Dose-response bioassays were conducted on area-wide collection of bollworm populations from major host plants, while biochemical techniques were used to evaluate basic mechanisms underlying resistance. RESULTS: Pyrethroid resistance is primarily associated with detoxification by enhanced esterase activity. High resistance to cypermethrin (RF = 67-1771), cross-resistance to deltamethrin (RF = 60-2972) and lack of cross-resistance to the non-ester pyrethroid etofenprox (RF = 2-10) were observed among H. armigera field populations and laboratory-selected strains. Enzymatic assays showed that esterase activity, but not oxidase content or glutathione-S-transferase activity, was positively correlated with resistance to cypermethrin. Pretreatment with piperonyl butoxide (PBO) resulted in significant synergism with cypermethrin in 6/10 field populations, but not in the laboratory-selected strain, indicating that additional mechanisms such as mixed-function oxidase (MFO) may be involved in field resistance. The absence of cross-resistance to DDT ruled out a possible target-site modification. CONCLUSION: Knowledge of the mechanisms involved in pyrethroid resistance and the lack of cross-resistance to spinosad and indoxacarb is a key to devising new resistance management strategies aimed at restoring the efficacy of pyrethroid-based programmes.
Resistance factor, ratio of LD50 for fourth-instar larval stage of Helicoverpa armigera field strain Ngong to LD50 for fourth-instar larval stage of pyrethroid-susceptible Helicoverpa armigera laboratory strain BK-77
|
Helicoverpa armigera
|
0.1
|
|
Journal : Pest Manag Sci
Title : Esterase-mediated resistance to pyrethroids in field populations of Helicoverpa armigera (Lepidoptera: Noctuidae) from Central Africa.
Year : 2009
Volume : 65
Issue : 10
First Page : 1147
Last Page : 1154
Authors : Achaleke J, Martin T, Ghogomu RT, Vaissayre M, Brévault T.
Abstract : BACKGROUND: Evolution of pyrethroid resistance in the cotton bollworm Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) threatens continued cotton production in Central Africa. Dose-response bioassays were conducted on area-wide collection of bollworm populations from major host plants, while biochemical techniques were used to evaluate basic mechanisms underlying resistance. RESULTS: Pyrethroid resistance is primarily associated with detoxification by enhanced esterase activity. High resistance to cypermethrin (RF = 67-1771), cross-resistance to deltamethrin (RF = 60-2972) and lack of cross-resistance to the non-ester pyrethroid etofenprox (RF = 2-10) were observed among H. armigera field populations and laboratory-selected strains. Enzymatic assays showed that esterase activity, but not oxidase content or glutathione-S-transferase activity, was positively correlated with resistance to cypermethrin. Pretreatment with piperonyl butoxide (PBO) resulted in significant synergism with cypermethrin in 6/10 field populations, but not in the laboratory-selected strain, indicating that additional mechanisms such as mixed-function oxidase (MFO) may be involved in field resistance. The absence of cross-resistance to DDT ruled out a possible target-site modification. CONCLUSION: Knowledge of the mechanisms involved in pyrethroid resistance and the lack of cross-resistance to spinosad and indoxacarb is a key to devising new resistance management strategies aimed at restoring the efficacy of pyrethroid-based programmes.
Resistance factor, ratio of LD50 for fourth-instar larval stage of Helicoverpa armigera field strain Pitoa isolated from tomato plant to LD50 for fourth-instar larval stage of pyrethroid-susceptible Helicoverpa armigera laboratory strain BK-77
|
Helicoverpa armigera
|
1.0
|
|
Journal : Pest Manag Sci
Title : Esterase-mediated resistance to pyrethroids in field populations of Helicoverpa armigera (Lepidoptera: Noctuidae) from Central Africa.
Year : 2009
Volume : 65
Issue : 10
First Page : 1147
Last Page : 1154
Authors : Achaleke J, Martin T, Ghogomu RT, Vaissayre M, Brévault T.
Abstract : BACKGROUND: Evolution of pyrethroid resistance in the cotton bollworm Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) threatens continued cotton production in Central Africa. Dose-response bioassays were conducted on area-wide collection of bollworm populations from major host plants, while biochemical techniques were used to evaluate basic mechanisms underlying resistance. RESULTS: Pyrethroid resistance is primarily associated with detoxification by enhanced esterase activity. High resistance to cypermethrin (RF = 67-1771), cross-resistance to deltamethrin (RF = 60-2972) and lack of cross-resistance to the non-ester pyrethroid etofenprox (RF = 2-10) were observed among H. armigera field populations and laboratory-selected strains. Enzymatic assays showed that esterase activity, but not oxidase content or glutathione-S-transferase activity, was positively correlated with resistance to cypermethrin. Pretreatment with piperonyl butoxide (PBO) resulted in significant synergism with cypermethrin in 6/10 field populations, but not in the laboratory-selected strain, indicating that additional mechanisms such as mixed-function oxidase (MFO) may be involved in field resistance. The absence of cross-resistance to DDT ruled out a possible target-site modification. CONCLUSION: Knowledge of the mechanisms involved in pyrethroid resistance and the lack of cross-resistance to spinosad and indoxacarb is a key to devising new resistance management strategies aimed at restoring the efficacy of pyrethroid-based programmes.
Resistance factor, ratio of LD50 for fourth-instar larval stage of Helicoverpa armigera field strain Pitoa isolated from maize plant to LD50 for fourth-instar larval stage of pyrethroid-susceptible Helicoverpa armigera laboratory strain BK-77
|
Helicoverpa armigera
|
1.0
|
|
Journal : Pest Manag Sci
Title : Esterase-mediated resistance to pyrethroids in field populations of Helicoverpa armigera (Lepidoptera: Noctuidae) from Central Africa.
Year : 2009
Volume : 65
Issue : 10
First Page : 1147
Last Page : 1154
Authors : Achaleke J, Martin T, Ghogomu RT, Vaissayre M, Brévault T.
Abstract : BACKGROUND: Evolution of pyrethroid resistance in the cotton bollworm Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) threatens continued cotton production in Central Africa. Dose-response bioassays were conducted on area-wide collection of bollworm populations from major host plants, while biochemical techniques were used to evaluate basic mechanisms underlying resistance. RESULTS: Pyrethroid resistance is primarily associated with detoxification by enhanced esterase activity. High resistance to cypermethrin (RF = 67-1771), cross-resistance to deltamethrin (RF = 60-2972) and lack of cross-resistance to the non-ester pyrethroid etofenprox (RF = 2-10) were observed among H. armigera field populations and laboratory-selected strains. Enzymatic assays showed that esterase activity, but not oxidase content or glutathione-S-transferase activity, was positively correlated with resistance to cypermethrin. Pretreatment with piperonyl butoxide (PBO) resulted in significant synergism with cypermethrin in 6/10 field populations, but not in the laboratory-selected strain, indicating that additional mechanisms such as mixed-function oxidase (MFO) may be involved in field resistance. The absence of cross-resistance to DDT ruled out a possible target-site modification. CONCLUSION: Knowledge of the mechanisms involved in pyrethroid resistance and the lack of cross-resistance to spinosad and indoxacarb is a key to devising new resistance management strategies aimed at restoring the efficacy of pyrethroid-based programmes.
Resistance factor, ratio of LD50 for fourth-instar larval stage of pyrethroid-resistance Helicoverpa armigera laboratory strain GS-RR06 to LD50 for fourth-instar larval stage of pyrethroid-susceptible Helicoverpa armigera laboratory strain BK-77
|
Helicoverpa armigera
|
0.7
|
|
Journal : Pest Manag Sci
Title : Esterase-mediated resistance to pyrethroids in field populations of Helicoverpa armigera (Lepidoptera: Noctuidae) from Central Africa.
Year : 2009
Volume : 65
Issue : 10
First Page : 1147
Last Page : 1154
Authors : Achaleke J, Martin T, Ghogomu RT, Vaissayre M, Brévault T.
Abstract : BACKGROUND: Evolution of pyrethroid resistance in the cotton bollworm Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) threatens continued cotton production in Central Africa. Dose-response bioassays were conducted on area-wide collection of bollworm populations from major host plants, while biochemical techniques were used to evaluate basic mechanisms underlying resistance. RESULTS: Pyrethroid resistance is primarily associated with detoxification by enhanced esterase activity. High resistance to cypermethrin (RF = 67-1771), cross-resistance to deltamethrin (RF = 60-2972) and lack of cross-resistance to the non-ester pyrethroid etofenprox (RF = 2-10) were observed among H. armigera field populations and laboratory-selected strains. Enzymatic assays showed that esterase activity, but not oxidase content or glutathione-S-transferase activity, was positively correlated with resistance to cypermethrin. Pretreatment with piperonyl butoxide (PBO) resulted in significant synergism with cypermethrin in 6/10 field populations, but not in the laboratory-selected strain, indicating that additional mechanisms such as mixed-function oxidase (MFO) may be involved in field resistance. The absence of cross-resistance to DDT ruled out a possible target-site modification. CONCLUSION: Knowledge of the mechanisms involved in pyrethroid resistance and the lack of cross-resistance to spinosad and indoxacarb is a key to devising new resistance management strategies aimed at restoring the efficacy of pyrethroid-based programmes.
Insecticidal activity against fourth-instar larval stage of Helicoverpa armigera field strain Gaschiga isolated from tomato plant assessed as mortality applied topically onto thorax measured after 48 hr
|
Helicoverpa armigera
|
25.9
microgAi/g
|
|
Journal : Pest Manag Sci
Title : Esterase-mediated resistance to pyrethroids in field populations of Helicoverpa armigera (Lepidoptera: Noctuidae) from Central Africa.
Year : 2009
Volume : 65
Issue : 10
First Page : 1147
Last Page : 1154
Authors : Achaleke J, Martin T, Ghogomu RT, Vaissayre M, Brévault T.
Abstract : BACKGROUND: Evolution of pyrethroid resistance in the cotton bollworm Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) threatens continued cotton production in Central Africa. Dose-response bioassays were conducted on area-wide collection of bollworm populations from major host plants, while biochemical techniques were used to evaluate basic mechanisms underlying resistance. RESULTS: Pyrethroid resistance is primarily associated with detoxification by enhanced esterase activity. High resistance to cypermethrin (RF = 67-1771), cross-resistance to deltamethrin (RF = 60-2972) and lack of cross-resistance to the non-ester pyrethroid etofenprox (RF = 2-10) were observed among H. armigera field populations and laboratory-selected strains. Enzymatic assays showed that esterase activity, but not oxidase content or glutathione-S-transferase activity, was positively correlated with resistance to cypermethrin. Pretreatment with piperonyl butoxide (PBO) resulted in significant synergism with cypermethrin in 6/10 field populations, but not in the laboratory-selected strain, indicating that additional mechanisms such as mixed-function oxidase (MFO) may be involved in field resistance. The absence of cross-resistance to DDT ruled out a possible target-site modification. CONCLUSION: Knowledge of the mechanisms involved in pyrethroid resistance and the lack of cross-resistance to spinosad and indoxacarb is a key to devising new resistance management strategies aimed at restoring the efficacy of pyrethroid-based programmes.
Insecticidal activity against fourth-instar larval stage of Helicoverpa armigera field strain Ngong isolated from cotton plant assessed as mortality applied topically onto thorax measured after 48 hr
|
Helicoverpa armigera
|
34.0
microgAi/g
|
|
Journal : Pest Manag Sci
Title : Esterase-mediated resistance to pyrethroids in field populations of Helicoverpa armigera (Lepidoptera: Noctuidae) from Central Africa.
Year : 2009
Volume : 65
Issue : 10
First Page : 1147
Last Page : 1154
Authors : Achaleke J, Martin T, Ghogomu RT, Vaissayre M, Brévault T.
Abstract : BACKGROUND: Evolution of pyrethroid resistance in the cotton bollworm Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) threatens continued cotton production in Central Africa. Dose-response bioassays were conducted on area-wide collection of bollworm populations from major host plants, while biochemical techniques were used to evaluate basic mechanisms underlying resistance. RESULTS: Pyrethroid resistance is primarily associated with detoxification by enhanced esterase activity. High resistance to cypermethrin (RF = 67-1771), cross-resistance to deltamethrin (RF = 60-2972) and lack of cross-resistance to the non-ester pyrethroid etofenprox (RF = 2-10) were observed among H. armigera field populations and laboratory-selected strains. Enzymatic assays showed that esterase activity, but not oxidase content or glutathione-S-transferase activity, was positively correlated with resistance to cypermethrin. Pretreatment with piperonyl butoxide (PBO) resulted in significant synergism with cypermethrin in 6/10 field populations, but not in the laboratory-selected strain, indicating that additional mechanisms such as mixed-function oxidase (MFO) may be involved in field resistance. The absence of cross-resistance to DDT ruled out a possible target-site modification. CONCLUSION: Knowledge of the mechanisms involved in pyrethroid resistance and the lack of cross-resistance to spinosad and indoxacarb is a key to devising new resistance management strategies aimed at restoring the efficacy of pyrethroid-based programmes.
Insecticidal activity against fourth-instar larval stage of Helicoverpa armigera field strain Pitoa isolated from tomato plant assessed as mortality applied topically onto thorax measured after 48 hr
|
Helicoverpa armigera
|
36.2
microgAi/g
|
|
Journal : Pest Manag Sci
Title : Esterase-mediated resistance to pyrethroids in field populations of Helicoverpa armigera (Lepidoptera: Noctuidae) from Central Africa.
Year : 2009
Volume : 65
Issue : 10
First Page : 1147
Last Page : 1154
Authors : Achaleke J, Martin T, Ghogomu RT, Vaissayre M, Brévault T.
Abstract : BACKGROUND: Evolution of pyrethroid resistance in the cotton bollworm Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) threatens continued cotton production in Central Africa. Dose-response bioassays were conducted on area-wide collection of bollworm populations from major host plants, while biochemical techniques were used to evaluate basic mechanisms underlying resistance. RESULTS: Pyrethroid resistance is primarily associated with detoxification by enhanced esterase activity. High resistance to cypermethrin (RF = 67-1771), cross-resistance to deltamethrin (RF = 60-2972) and lack of cross-resistance to the non-ester pyrethroid etofenprox (RF = 2-10) were observed among H. armigera field populations and laboratory-selected strains. Enzymatic assays showed that esterase activity, but not oxidase content or glutathione-S-transferase activity, was positively correlated with resistance to cypermethrin. Pretreatment with piperonyl butoxide (PBO) resulted in significant synergism with cypermethrin in 6/10 field populations, but not in the laboratory-selected strain, indicating that additional mechanisms such as mixed-function oxidase (MFO) may be involved in field resistance. The absence of cross-resistance to DDT ruled out a possible target-site modification. CONCLUSION: Knowledge of the mechanisms involved in pyrethroid resistance and the lack of cross-resistance to spinosad and indoxacarb is a key to devising new resistance management strategies aimed at restoring the efficacy of pyrethroid-based programmes.
Insecticidal activity against fourth-instar larval stage of Helicoverpa armigera field strain Pitoa isolated from maize plant assessed as mortality applied topically onto thorax measured after 48 hr
|
Helicoverpa armigera
|
37.9
microgAi/g
|
|
Journal : Pest Manag Sci
Title : Esterase-mediated resistance to pyrethroids in field populations of Helicoverpa armigera (Lepidoptera: Noctuidae) from Central Africa.
Year : 2009
Volume : 65
Issue : 10
First Page : 1147
Last Page : 1154
Authors : Achaleke J, Martin T, Ghogomu RT, Vaissayre M, Brévault T.
Abstract : BACKGROUND: Evolution of pyrethroid resistance in the cotton bollworm Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) threatens continued cotton production in Central Africa. Dose-response bioassays were conducted on area-wide collection of bollworm populations from major host plants, while biochemical techniques were used to evaluate basic mechanisms underlying resistance. RESULTS: Pyrethroid resistance is primarily associated with detoxification by enhanced esterase activity. High resistance to cypermethrin (RF = 67-1771), cross-resistance to deltamethrin (RF = 60-2972) and lack of cross-resistance to the non-ester pyrethroid etofenprox (RF = 2-10) were observed among H. armigera field populations and laboratory-selected strains. Enzymatic assays showed that esterase activity, but not oxidase content or glutathione-S-transferase activity, was positively correlated with resistance to cypermethrin. Pretreatment with piperonyl butoxide (PBO) resulted in significant synergism with cypermethrin in 6/10 field populations, but not in the laboratory-selected strain, indicating that additional mechanisms such as mixed-function oxidase (MFO) may be involved in field resistance. The absence of cross-resistance to DDT ruled out a possible target-site modification. CONCLUSION: Knowledge of the mechanisms involved in pyrethroid resistance and the lack of cross-resistance to spinosad and indoxacarb is a key to devising new resistance management strategies aimed at restoring the efficacy of pyrethroid-based programmes.
Insecticidal activity against fourth-instar larval stage of pyrethroid-resistance Helicoverpa armigera laboratory strain GS-RR06 assessed as mortality applied topically onto thorax measured after 48 hr
|
Helicoverpa armigera
|
27.5
microgAi/g
|
|
Journal : Pest Manag Sci
Title : Esterase-mediated resistance to pyrethroids in field populations of Helicoverpa armigera (Lepidoptera: Noctuidae) from Central Africa.
Year : 2009
Volume : 65
Issue : 10
First Page : 1147
Last Page : 1154
Authors : Achaleke J, Martin T, Ghogomu RT, Vaissayre M, Brévault T.
Abstract : BACKGROUND: Evolution of pyrethroid resistance in the cotton bollworm Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) threatens continued cotton production in Central Africa. Dose-response bioassays were conducted on area-wide collection of bollworm populations from major host plants, while biochemical techniques were used to evaluate basic mechanisms underlying resistance. RESULTS: Pyrethroid resistance is primarily associated with detoxification by enhanced esterase activity. High resistance to cypermethrin (RF = 67-1771), cross-resistance to deltamethrin (RF = 60-2972) and lack of cross-resistance to the non-ester pyrethroid etofenprox (RF = 2-10) were observed among H. armigera field populations and laboratory-selected strains. Enzymatic assays showed that esterase activity, but not oxidase content or glutathione-S-transferase activity, was positively correlated with resistance to cypermethrin. Pretreatment with piperonyl butoxide (PBO) resulted in significant synergism with cypermethrin in 6/10 field populations, but not in the laboratory-selected strain, indicating that additional mechanisms such as mixed-function oxidase (MFO) may be involved in field resistance. The absence of cross-resistance to DDT ruled out a possible target-site modification. CONCLUSION: Knowledge of the mechanisms involved in pyrethroid resistance and the lack of cross-resistance to spinosad and indoxacarb is a key to devising new resistance management strategies aimed at restoring the efficacy of pyrethroid-based programmes.
Insecticidal activity against fourth-instar larval stage of pyrethroid-susceptible Helicoverpa armigera laboratory strain BK-77 assessed as mortality applied topically onto thorax measured after 48 hr
|
Helicoverpa armigera
|
37.6
microgAi/g
|
|
Journal : Pest Manag Sci
Title : Esterase-mediated resistance to pyrethroids in field populations of Helicoverpa armigera (Lepidoptera: Noctuidae) from Central Africa.
Year : 2009
Volume : 65
Issue : 10
First Page : 1147
Last Page : 1154
Authors : Achaleke J, Martin T, Ghogomu RT, Vaissayre M, Brévault T.
Abstract : BACKGROUND: Evolution of pyrethroid resistance in the cotton bollworm Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) threatens continued cotton production in Central Africa. Dose-response bioassays were conducted on area-wide collection of bollworm populations from major host plants, while biochemical techniques were used to evaluate basic mechanisms underlying resistance. RESULTS: Pyrethroid resistance is primarily associated with detoxification by enhanced esterase activity. High resistance to cypermethrin (RF = 67-1771), cross-resistance to deltamethrin (RF = 60-2972) and lack of cross-resistance to the non-ester pyrethroid etofenprox (RF = 2-10) were observed among H. armigera field populations and laboratory-selected strains. Enzymatic assays showed that esterase activity, but not oxidase content or glutathione-S-transferase activity, was positively correlated with resistance to cypermethrin. Pretreatment with piperonyl butoxide (PBO) resulted in significant synergism with cypermethrin in 6/10 field populations, but not in the laboratory-selected strain, indicating that additional mechanisms such as mixed-function oxidase (MFO) may be involved in field resistance. The absence of cross-resistance to DDT ruled out a possible target-site modification. CONCLUSION: Knowledge of the mechanisms involved in pyrethroid resistance and the lack of cross-resistance to spinosad and indoxacarb is a key to devising new resistance management strategies aimed at restoring the efficacy of pyrethroid-based programmes.
Insecticidal activity against Drosophila suzukii assessed as mortality at 1.1 g/ha by direct application at 22 degC measured after 24 hr
|
Drosophila suzukii
|
None
|
|
Journal : Pest Manag Sci
Title : Laboratory and field comparisons of insecticides to reduce infestation of Drosophila suzukii in berry crops.
Year : 2011
Volume : 67
Issue : 11
First Page : 1375
Last Page : 1385
Authors : Bruck DJ, Bolda M, Tanigoshi L, Klick J, Kleiber J, DeFrancesco J, Gerdeman B, Spitler H.
Abstract : BACKGROUND: The spotted wing Drosophila, Drosophila suzukii (Matsumura, 1931) (Diptera: Drosophilidae), is an invasive pest of small-fruit crops. Unlike most other Drosophila, this insect is able to oviposit into and damage ripe and ripening fruit, making it unmarketable. Because this is a new pest in the United States, it is necessary to identify registered insecticides to manage this insect effectively in conventional and organic production systems. RESULTS: The present laboratory bioassays and field trials identified a number of insecticides representing various modes of action that are effective in controlling D. suzukii. Products that performed well in the laboratory bioassay also performed well in the field, indicating that screening of new chemistries in the laboratory is a worthy exercise. Field application of pyrethoids, organophosphates or spinosyns provided 5-14 days of residual control of D. suzukii. The efficacy of the neonicotinoids as adulticides was not satisfactory compared with the other contact-mode-of-action chemistries. Based on the zero tolerance by the small-fruit industry and the individual effects mentioned above, neonicotinoids are not currently recommended for D. suzukii management. CONCLUSIONS: There are effective insecticides registered for controlling D. suzukii infestations in susceptible small-fruit crops.