Shekeban, M., Ibrahim, M. (2005). SYNERGISED CYPERMETHRIN AND -CYPERMETHRIN AS RESISTANCE MANAGEMENT STRATEGY IN PINK BOLLWORM Pectinophora gossypiella (SAUNDERS).. Journal of Plant Protection and Pathology, 30(3), 1647-1654. doi: 10.21608/jppp.2005.238766
M M. K Shekeban; Mahasen Ibrahim. "SYNERGISED CYPERMETHRIN AND -CYPERMETHRIN AS RESISTANCE MANAGEMENT STRATEGY IN PINK BOLLWORM Pectinophora gossypiella (SAUNDERS).". Journal of Plant Protection and Pathology, 30, 3, 2005, 1647-1654. doi: 10.21608/jppp.2005.238766
Shekeban, M., Ibrahim, M. (2005). 'SYNERGISED CYPERMETHRIN AND -CYPERMETHRIN AS RESISTANCE MANAGEMENT STRATEGY IN PINK BOLLWORM Pectinophora gossypiella (SAUNDERS).', Journal of Plant Protection and Pathology, 30(3), pp. 1647-1654. doi: 10.21608/jppp.2005.238766
Shekeban, M., Ibrahim, M. SYNERGISED CYPERMETHRIN AND -CYPERMETHRIN AS RESISTANCE MANAGEMENT STRATEGY IN PINK BOLLWORM Pectinophora gossypiella (SAUNDERS).. Journal of Plant Protection and Pathology, 2005; 30(3): 1647-1654. doi: 10.21608/jppp.2005.238766
SYNERGISED CYPERMETHRIN AND -CYPERMETHRIN AS RESISTANCE MANAGEMENT STRATEGY IN PINK BOLLWORM Pectinophora gossypiella (SAUNDERS).
Plant Protection Research Institute, Agriculture R esearch Center, Egypt.
Abstract
Two dichlorovinyl pyrethroids and one n-methyl carbamate insecticide, were determined against both laboratory and field male moth strains of pink bollworm Pectinophora gossypiella (Saunders). Toxicity data demonstrated that, LC50 values were 0.14 and 2.85 ppm for cypermethrin, 0.125 and 2.96 ppm for alpha-cypermethrin while they were 4.45 and 39.46 ppm for carbaryl against laboratory and field strains respectively.Pyrethroid–carbaryl combinations were more effective against the field population than that of each individual. Pyrethroid toxicity in the mixture was increased from 13.57 and 5.58 fold with co-toxicity factor of 90 and 75.4 for cypermethrin and alpha-cypermethrin, respectively. On the other hand, carbaryl toxicity was increased in the mixture to 37.94 and 14.95 fold for carbaryl/cypermethrin and carbaryl/ alpha-cypermethrin, respectively.Determining resistance data based on comparing LC50 values of the laboratory strain showed high resistance levels in the field population. The resistance ratio values were 20.36 and 23.68 fold for cypermethrin and alpha-cypermethrin, respectively; while mixing with carbaryl decreased these levels to 1.5 fold for cypermethrin and 4.24 fold for alpha-cypermethrin. In case of carbaryl, resistance ratio values decreased from 8.87 fold to 0.23 and 0.59 fold in mixture with cypermethrin and alpha-cypermethrin, respectively.
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