Laboratory and field evaluation of spinosad and some big-insecticides for controlling the cotton leafworm, spodoptera littoralis (Bosid.) (Lep.: noctuidae) on cotton [electronic resource].

Includes references.

Four commercial fonnulations Spinosad (a new bioinsecticide which derived from a speices of actinomycetes bacteria Sacharopolyspora spinosa), Biogard, Agerin and Bioteet which based on Bacillus thuringiensis were evaluated under laboratory. semifield and field conditions against larval instars ofSpodoptera littoralis at recommended rates. Results showed that the 2nd instar larvae was more sensitive to all tested bioinsecticides than the 4th instar The data also indicated that the Spinosad was more effective than Biogard, Agerin and Biotect, respectively. In the semifield experiments, Spinosad was the most effective one. it caused 92% end-mortality for S. littoralis 2nd instar larvae, "hen it fed on cotton leaves sampled one hour after spraying, while when Agerin, Biogard and Bioteet were used, percentage of mortality were 75, 71, and 70, respoojvely. Under field conditions, the data also showed that, SplOosad was the most effective against larvae of S. littoralis than the other tested bioinsecticides the percentage ofreduetion reached to 97.3 compared to 78.1, 72.8 and 68.5 in case of Agerin, Biogard and Biotect, respectively after 8 days of spraying.

Summary in Arabic.

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