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Ali H Sayyed - One of the best experts on this subject based on the ideXlab platform.
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efficacy of insecticide mixtures against pyrethroid and organophosphate resistant populations of spodoptera litura lepidoptera noctuidae
Pest Management Science, 2009Co-Authors: Munir Ahmad, Mushtaq A Saleem, Ali H SayyedAbstract:BACKGROUND:Spodoptera litura (F.) is an important pest worldwide, with over 112 host plants, and is exposed to insecticides throughout the year, resulting in the rapid development of resistance. Insecticide mixtures can delay the development of resistance more effectively than sequences or rotations. Cypermethrin, deltamethrin, profenofos, chlorpyrifos and fipronil were assessed separately and in mixtures against laboratory susceptible S. litura and two field-collected populations. RESULTS: The field-collected population from Khanewal (KWL) was significantly more resistant to Cypermethrin, deltamethrin, chlorpyrifos and profenofos than one collected from Muzaffar Garh (MGH). Mixtures of Cypermethrin + chlorpyrifos or profenofos and of deltamethrin + chlorpyrifos or profenofos at 1:1, 1:10 and 1:20 ratios significantly increased (P < 0.01) toxicity to Cypermethrin and deltamethrin in field populations. The combination indices of Cypermethrin + chlorpyrifos at 1:1 and 1:10 ratios and Cypermethrin + fipronil at 1:1, 1:10 and 1:20 ratios for the KWL strain and of Cypermethrin + profenofos or fipronil at 1:1, 1:10 and 1:20 ratios for MGH were significantly below 1, suggesting synergistic interactions. The inhibitors DEF and PBO largely overcame resistance to deltamethrin, Cypermethrin and profenofos, suggesting that resistance to the insecticides was associated with esterase and monooxygenase detoxification respectively. CONCLUSION: Chlorpyrifos, profenofos and fipronil could be used in mixtures to restore Cypermethrin and deltamethrin susceptibility. These findings may have considerable practical implications for S. litura resistance management. Copyright © 2008 Society of Chemical Industry
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efficacy of insecticide mixtures against pyrethroid and organophosphate resistant populations of spodoptera litura lepidoptera noctuidae
Pest Management Science, 2009Co-Authors: Munir Ahmad, Mushtaq A Saleem, Ali H SayyedAbstract:BACKGROUND:Spodoptera litura (F.) is an important pest worldwide, with over 112 host plants, and is exposed to insecticides throughout the year, resulting in the rapid development of resistance. Insecticide mixtures can delay the development of resistance more effectively than sequences or rotations. Cypermethrin, deltamethrin, profenofos, chlorpyrifos and fipronil were assessed separately and in mixtures against laboratory susceptible S. litura and two field-collected populations. RESULTS: The field-collected population from Khanewal (KWL) was significantly more resistant to Cypermethrin, deltamethrin, chlorpyrifos and profenofos than one collected from Muzaffar Garh (MGH). Mixtures of Cypermethrin + chlorpyrifos or profenofos and of deltamethrin + chlorpyrifos or profenofos at 1:1, 1:10 and 1:20 ratios significantly increased (P < 0.01) toxicity to Cypermethrin and deltamethrin in field populations. The combination indices of Cypermethrin + chlorpyrifos at 1:1 and 1:10 ratios and Cypermethrin + fipronil at 1:1, 1:10 and 1:20 ratios for the KWL strain and of Cypermethrin + profenofos or fipronil at 1:1, 1:10 and 1:20 ratios for MGH were significantly below 1, suggesting synergistic interactions. The inhibitors DEF and PBO largely overcame resistance to deltamethrin, Cypermethrin and profenofos, suggesting that resistance to the insecticides was associated with esterase and monooxygenase detoxification respectively. CONCLUSION: Chlorpyrifos, profenofos and fipronil could be used in mixtures to restore Cypermethrin and deltamethrin susceptibility. These findings may have considerable practical implications for S. litura resistance management. Copyright © 2008 Society of Chemical Industry
Mushtaq Ahmad - One of the best experts on this subject based on the ideXlab platform.
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Potentiation/Antagonism of pyrethroids with organophosphate insecticides in Bemisia tabaci (Homoptera: Aleyrodidae).
Journal of Economic Entomology, 2007Co-Authors: Mushtaq AhmadAbstract:Abstract The binary mixtures of pyrethroids Cypermethrin, α-Cypermethrin, ζ-Cypermethrin, bifenthrin, fenpropathrin, λ-cyhalothrin, and deltamethrin plus organophosphates ethion, profenofos, chlorpyrifos, quinalphos, acephate, methamidophos, methyl parathion, and triazophos were evaluated on putatively resistant field populations ofBemisia tabaci (Gennadius) (Homoptera: Aleyrodidae) from Pakistan using a leaf-dip bioassay. Ethion exhibited good potentiation with all the pyrethroids. Quinalphos potentiated Cypermethrin, fenpropathrin, and λ-cyhalothrin but not bifenthrin. Acephate was potentiating with bifenthrin and fenpropathrin but antagonistic with ζ-Cypermethrin. A potentiation effect was also found when methamidophos was mixed with bifenthrin and fenpropathrin. However, profenofos was antagonistic with Cypermethrin, bifenthrin, and λ-cyhalothrin. Similarly, bifenthrin + methyl parathion and deltamethrin + triazophos mixtures were antagonistic when tested on several populations ofB.tabaci. Chlorpyrifo...
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potentiation antagonism of pyrethroids with organophosphate insecticides in bemisia tabaci homoptera aleyrodidae
Journal of Economic Entomology, 2007Co-Authors: Mushtaq AhmadAbstract:Abstract The binary mixtures of pyrethroids Cypermethrin, α-Cypermethrin, ζ-Cypermethrin, bifenthrin, fenpropathrin, λ-cyhalothrin, and deltamethrin plus organophosphates ethion, profenofos, chlorpyrifos, quinalphos, acephate, methamidophos, methyl parathion, and triazophos were evaluated on putatively resistant field populations ofBemisia tabaci (Gennadius) (Homoptera: Aleyrodidae) from Pakistan using a leaf-dip bioassay. Ethion exhibited good potentiation with all the pyrethroids. Quinalphos potentiated Cypermethrin, fenpropathrin, and λ-cyhalothrin but not bifenthrin. Acephate was potentiating with bifenthrin and fenpropathrin but antagonistic with ζ-Cypermethrin. A potentiation effect was also found when methamidophos was mixed with bifenthrin and fenpropathrin. However, profenofos was antagonistic with Cypermethrin, bifenthrin, and λ-cyhalothrin. Similarly, bifenthrin + methyl parathion and deltamethrin + triazophos mixtures were antagonistic when tested on several populations ofB.tabaci. Chlorpyrifo...
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potentiation antagonism of deltamethrin and Cypermethrins with organophosphate insecticides in the cotton bollworm helicoverpa armigera lepidoptera noctuidae
Pesticide Biochemistry and Physiology, 2004Co-Authors: Mushtaq AhmadAbstract:The joint action of pyrethroids deltamethrin and Cypermethrins in combination with organophosphates ethion, profenofos, chlorpyrifos, quinalphos, and triazophos was studied on putatively resistant field populations of Helicoverpa armigera from Pakistan by using a leaf-dip method. Ethion produced a good potentiation with deltamethrin, Cypermethrin, alphaCypermethrin, and zetaCypermethrin, whereas profenofos, chlorpyrifos, quinalphos, and triazophos exhibited an antagonism with deltamethrin as well as Cypermethrins. Implications of using mixtures for counteracting insecticide resistance are discussed.
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Potentiation/antagonism of deltamethrin and Cypermethrins with organophosphate insecticides in the cotton bollworm, Helicoverpa armigera (Lepidoptera: Noctuidae)
Pesticide Biochemistry and Physiology, 2004Co-Authors: Mushtaq AhmadAbstract:The joint action of pyrethroids deltamethrin and Cypermethrins in combination with organophosphates ethion, profenofos, chlorpyrifos, quinalphos, and triazophos was studied on putatively resistant field populations of Helicoverpa armigera from Pakistan by using a leaf-dip method. Ethion produced a good potentiation with deltamethrin, Cypermethrin, alphaCypermethrin, and zetaCypermethrin, whereas profenofos, chlorpyrifos, quinalphos, and triazophos exhibited an antagonism with deltamethrin as well as Cypermethrins. Implications of using mixtures for counteracting insecticide resistance are discussed.
Munir Ahmad - One of the best experts on this subject based on the ideXlab platform.
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efficacy of insecticide mixtures against pyrethroid and organophosphate resistant populations of spodoptera litura lepidoptera noctuidae
Pest Management Science, 2009Co-Authors: Munir Ahmad, Mushtaq A Saleem, Ali H SayyedAbstract:BACKGROUND:Spodoptera litura (F.) is an important pest worldwide, with over 112 host plants, and is exposed to insecticides throughout the year, resulting in the rapid development of resistance. Insecticide mixtures can delay the development of resistance more effectively than sequences or rotations. Cypermethrin, deltamethrin, profenofos, chlorpyrifos and fipronil were assessed separately and in mixtures against laboratory susceptible S. litura and two field-collected populations. RESULTS: The field-collected population from Khanewal (KWL) was significantly more resistant to Cypermethrin, deltamethrin, chlorpyrifos and profenofos than one collected from Muzaffar Garh (MGH). Mixtures of Cypermethrin + chlorpyrifos or profenofos and of deltamethrin + chlorpyrifos or profenofos at 1:1, 1:10 and 1:20 ratios significantly increased (P < 0.01) toxicity to Cypermethrin and deltamethrin in field populations. The combination indices of Cypermethrin + chlorpyrifos at 1:1 and 1:10 ratios and Cypermethrin + fipronil at 1:1, 1:10 and 1:20 ratios for the KWL strain and of Cypermethrin + profenofos or fipronil at 1:1, 1:10 and 1:20 ratios for MGH were significantly below 1, suggesting synergistic interactions. The inhibitors DEF and PBO largely overcame resistance to deltamethrin, Cypermethrin and profenofos, suggesting that resistance to the insecticides was associated with esterase and monooxygenase detoxification respectively. CONCLUSION: Chlorpyrifos, profenofos and fipronil could be used in mixtures to restore Cypermethrin and deltamethrin susceptibility. These findings may have considerable practical implications for S. litura resistance management. Copyright © 2008 Society of Chemical Industry
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efficacy of insecticide mixtures against pyrethroid and organophosphate resistant populations of spodoptera litura lepidoptera noctuidae
Pest Management Science, 2009Co-Authors: Munir Ahmad, Mushtaq A Saleem, Ali H SayyedAbstract:BACKGROUND:Spodoptera litura (F.) is an important pest worldwide, with over 112 host plants, and is exposed to insecticides throughout the year, resulting in the rapid development of resistance. Insecticide mixtures can delay the development of resistance more effectively than sequences or rotations. Cypermethrin, deltamethrin, profenofos, chlorpyrifos and fipronil were assessed separately and in mixtures against laboratory susceptible S. litura and two field-collected populations. RESULTS: The field-collected population from Khanewal (KWL) was significantly more resistant to Cypermethrin, deltamethrin, chlorpyrifos and profenofos than one collected from Muzaffar Garh (MGH). Mixtures of Cypermethrin + chlorpyrifos or profenofos and of deltamethrin + chlorpyrifos or profenofos at 1:1, 1:10 and 1:20 ratios significantly increased (P < 0.01) toxicity to Cypermethrin and deltamethrin in field populations. The combination indices of Cypermethrin + chlorpyrifos at 1:1 and 1:10 ratios and Cypermethrin + fipronil at 1:1, 1:10 and 1:20 ratios for the KWL strain and of Cypermethrin + profenofos or fipronil at 1:1, 1:10 and 1:20 ratios for MGH were significantly below 1, suggesting synergistic interactions. The inhibitors DEF and PBO largely overcame resistance to deltamethrin, Cypermethrin and profenofos, suggesting that resistance to the insecticides was associated with esterase and monooxygenase detoxification respectively. CONCLUSION: Chlorpyrifos, profenofos and fipronil could be used in mixtures to restore Cypermethrin and deltamethrin susceptibility. These findings may have considerable practical implications for S. litura resistance management. Copyright © 2008 Society of Chemical Industry
Mushtaq A Saleem - One of the best experts on this subject based on the ideXlab platform.
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efficacy of insecticide mixtures against pyrethroid and organophosphate resistant populations of spodoptera litura lepidoptera noctuidae
Pest Management Science, 2009Co-Authors: Munir Ahmad, Mushtaq A Saleem, Ali H SayyedAbstract:BACKGROUND:Spodoptera litura (F.) is an important pest worldwide, with over 112 host plants, and is exposed to insecticides throughout the year, resulting in the rapid development of resistance. Insecticide mixtures can delay the development of resistance more effectively than sequences or rotations. Cypermethrin, deltamethrin, profenofos, chlorpyrifos and fipronil were assessed separately and in mixtures against laboratory susceptible S. litura and two field-collected populations. RESULTS: The field-collected population from Khanewal (KWL) was significantly more resistant to Cypermethrin, deltamethrin, chlorpyrifos and profenofos than one collected from Muzaffar Garh (MGH). Mixtures of Cypermethrin + chlorpyrifos or profenofos and of deltamethrin + chlorpyrifos or profenofos at 1:1, 1:10 and 1:20 ratios significantly increased (P < 0.01) toxicity to Cypermethrin and deltamethrin in field populations. The combination indices of Cypermethrin + chlorpyrifos at 1:1 and 1:10 ratios and Cypermethrin + fipronil at 1:1, 1:10 and 1:20 ratios for the KWL strain and of Cypermethrin + profenofos or fipronil at 1:1, 1:10 and 1:20 ratios for MGH were significantly below 1, suggesting synergistic interactions. The inhibitors DEF and PBO largely overcame resistance to deltamethrin, Cypermethrin and profenofos, suggesting that resistance to the insecticides was associated with esterase and monooxygenase detoxification respectively. CONCLUSION: Chlorpyrifos, profenofos and fipronil could be used in mixtures to restore Cypermethrin and deltamethrin susceptibility. These findings may have considerable practical implications for S. litura resistance management. Copyright © 2008 Society of Chemical Industry
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efficacy of insecticide mixtures against pyrethroid and organophosphate resistant populations of spodoptera litura lepidoptera noctuidae
Pest Management Science, 2009Co-Authors: Munir Ahmad, Mushtaq A Saleem, Ali H SayyedAbstract:BACKGROUND:Spodoptera litura (F.) is an important pest worldwide, with over 112 host plants, and is exposed to insecticides throughout the year, resulting in the rapid development of resistance. Insecticide mixtures can delay the development of resistance more effectively than sequences or rotations. Cypermethrin, deltamethrin, profenofos, chlorpyrifos and fipronil were assessed separately and in mixtures against laboratory susceptible S. litura and two field-collected populations. RESULTS: The field-collected population from Khanewal (KWL) was significantly more resistant to Cypermethrin, deltamethrin, chlorpyrifos and profenofos than one collected from Muzaffar Garh (MGH). Mixtures of Cypermethrin + chlorpyrifos or profenofos and of deltamethrin + chlorpyrifos or profenofos at 1:1, 1:10 and 1:20 ratios significantly increased (P < 0.01) toxicity to Cypermethrin and deltamethrin in field populations. The combination indices of Cypermethrin + chlorpyrifos at 1:1 and 1:10 ratios and Cypermethrin + fipronil at 1:1, 1:10 and 1:20 ratios for the KWL strain and of Cypermethrin + profenofos or fipronil at 1:1, 1:10 and 1:20 ratios for MGH were significantly below 1, suggesting synergistic interactions. The inhibitors DEF and PBO largely overcame resistance to deltamethrin, Cypermethrin and profenofos, suggesting that resistance to the insecticides was associated with esterase and monooxygenase detoxification respectively. CONCLUSION: Chlorpyrifos, profenofos and fipronil could be used in mixtures to restore Cypermethrin and deltamethrin susceptibility. These findings may have considerable practical implications for S. litura resistance management. Copyright © 2008 Society of Chemical Industry
Jing Liu - One of the best experts on this subject based on the ideXlab platform.
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Cadmium potentiates toxicity of Cypermethrin in zebrafish
Environmental toxicology and chemistry, 2016Co-Authors: Ye Yang, Jing LiuAbstract:Co-occurrence of pesticides such as synthetic pyrethroids and metals in aquatic ecosystems raises concerns over their combined ecological effects. Cypermethrin, 1 of the top 5 synthetic pyrethroids in use, has been extensively detected in surface water. Cadmium (Cd) has been recognized as 1 of the most toxic metals and is a common contaminant in the aquatic system. However, little information is available regarding their joint toxicity. In the present study, combined toxicity of Cypermethrin and Cd and the underlying mechanisms were investigated. Zebrafish embryos and adults were exposed to the individual contaminant or binary mixtures. Co-exposure to Cypermethrin and Cd produced synergistic effects on the occurrence of crooked body, pericardial edema, and noninflation of swim bladder. The addition of Cd significantly potentiated Cypermethrin-induced spasms and caused more oxidative stress in zebrafish larvae. Cypermethrin-mediated induction of transcription levels and catalytic activities of cytochrome P450 (CYP) enzyme were significantly down-regulated by Cd in both zebrafish larvae and adults. Chemical analytical data showed that in vitro elimination of Cypermethrin by CYP1A1 was inhibited by Cd. The addition of Cd caused an elevation of in vivo Cypermethrin residue levels in the mixture-exposed adult zebrafish. These results suggest that the enhanced toxicity of Cypermethrin in the presence of Cd results from the inhibitory effects of Cd on CYP-mediated biotransformation of this pesticide. The authors' findings provide a deeper understanding of the mechanistic basis accounting for the joint toxicity of Cypermethrin and Cd.
