NASSEF, M., WATSON, W. (1998). EFFICIENCY OF CHITIN SYNTHESIS INHIBITORS, INSECTICIDES AND THEIR MIXTURES AGAINST THE FOURTH LARVAL INSTAR OF THE COTTON LEAFWORM. Egyptian Journal of Agricultural Research, 76(2), 555-565. doi: 10.21608/ejar.1998.350240
MOHAMED A. NASSEF; WATSON M. WATSON. "EFFICIENCY OF CHITIN SYNTHESIS INHIBITORS, INSECTICIDES AND THEIR MIXTURES AGAINST THE FOURTH LARVAL INSTAR OF THE COTTON LEAFWORM". Egyptian Journal of Agricultural Research, 76, 2, 1998, 555-565. doi: 10.21608/ejar.1998.350240
NASSEF, M., WATSON, W. (1998). 'EFFICIENCY OF CHITIN SYNTHESIS INHIBITORS, INSECTICIDES AND THEIR MIXTURES AGAINST THE FOURTH LARVAL INSTAR OF THE COTTON LEAFWORM', Egyptian Journal of Agricultural Research, 76(2), pp. 555-565. doi: 10.21608/ejar.1998.350240
NASSEF, M., WATSON, W. EFFICIENCY OF CHITIN SYNTHESIS INHIBITORS, INSECTICIDES AND THEIR MIXTURES AGAINST THE FOURTH LARVAL INSTAR OF THE COTTON LEAFWORM. Egyptian Journal of Agricultural Research, 1998; 76(2): 555-565. doi: 10.21608/ejar.1998.350240
EFFICIENCY OF CHITIN SYNTHESIS INHIBITORS, INSECTICIDES AND THEIR MIXTURES AGAINST THE FOURTH LARVAL INSTAR OF THE COTTON LEAFWORM
Plant Protection Research Institute, Agricultural Research Centre, Giza, Egypt
Abstract
The effect of chitin synthesis inhibitors when applied singly or in binary mixtures with conventional insecticides against different ages of fourth instar larvae of the cotton leafworm Spodoptera littoral's was studied throughout the present investigation. The results obtained indicate that the most suitable age of fourth instar larvae was 24 hr to evaluate the efficiency of chitin synthesis inhibitors. Conventional insecticides and their binary mixtures with chitin synthesis inhibitors were more potent to early and middle age of such instar (8-24 hr). All the tested compounds induced lower effect when used against the older larvae (40-64 hr). Regarding the effect of chitin synthesis inhibitors on the performance of insecticides, DC 902 mixture showed an obvious antagonistic effect, while Catabron mixture revealed an additive effect. On other hand, additive and potentiation effects occurred in case of Deenate mixture.
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