Efficacy certain insecticides against spodoptera littoralis (boisd.) and bemisia tabaci (genn). infesting soybean plants and their associated predators


Field and laboratory experiments were carried out at plant protection research institute and the fields of Zagazig district on soybean during 2018 and 2019 seasons. The tested insecticides were Actelic, KZoil, Super-misrona and Actra against Spodoptera littoralis and Bemisia tabaci and associated predators. Results showed that Actelic was the most effective compound followed by Kz oil while Actra was the least effective one against Spodoptera littoralis, residual effects were 58.0, 43.0, 33.0 and 25.0%. The residual effect of B.tabaci nymphs were 75.42, 70.94, 86.63 and 20.63 for the same tested pesticides, Super-misrona, Actelic, KZoil, and Actra, respectively. The results obviously revealed that primiphosmethyl(Actelic) and thiamethoxam (Actra) were the most effective compound causing in general, the highest percentage of C. undecimpunctata and C. carnea population reduction ether after three days post- treatment or after any of the two tested post-treatment periods.


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