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The effectiveness of some non-traditional materials as pesticides to eggs and larvae of cotton leafworm(Bosid.)

Research Authors
Gamal Abdel-latif M. Abdu-Allah
Research Abstract

Cotton leafworm is one of the most important insect pests infesting different varieties of vegetable as well as field crops. Non-conventional insecticides are the promised and used as the alternative agents of traditional pesticides especially in the Integrated Pest Management (IPM) programs. Under laboratory conditions six of these agents plus the carbamate insecticide; methomyl ; were tested against the 48 hours aged eggs as well as the 2nd instar larvae of the cotton leaf worm using both dipping and feeding bioassay techniques, respectively. Based on the LC50 values, emamectin benzoate showed the most effective insecticide as ovicidal and larvicidal action, while jojoba oil showed the least efficient one. The toxicity of the tested compounds could be descendingly arranged as ovicidal action as follows: emamectin benzoate > azadirachtin > methomyl > spinetoram > spinosad > abamectin> jojoba oil. Whereas, the trend of these agents as larvicidal action was emamectin benzoate>methomyl > spinetoram > abamectin >spinosad > azadirachtin > jojoba oil. Emamctin benzoate and azadirachtin have more ovicidal potent effect than spinetoram by 12, 2 fold respectively. Also, the toxic effect of emamectin benzoate against 2nd instar larvae of S. littoralis was 31 and 258 folds as toxic as the toxicity of methomyl and spinetoram, respectively. Azadirachtin exhibited a moderate lavicidal effect, where the LC50 value was 395.67 ppm. Based on the present data, it can be suggested that emamectin benzoate and azadirachtin having good candidate agents as ovicidal pesticides. Moreover, the former was the best candidate as lavicidal pesticides. Also, those agents could be involved in integrated cotton leaf worm program.

Research Department
Research Journal
Egyptian Journal of Agricultural Research
Research Publisher
Egyptian National Agricultural Library
Research Rank
3
Research Vol
93
Research Website
http://connection.ebscohost.com/c/articles/110910124/effectiveness-some-non-traditional-materials-as-pesticides-eggs-larvae-cotton-leaf-worm-bosid
Research Year
2015
Research Pages
157-167