Susceptibility of two important cotton insects, Spodoptera littoralis (boisd) and Agrotis ipsilon (huf.) to the entomopa-thogenic fungus Metarhizium anisopliae [electronic resource].

Includes reference.

Laboratory bioassay of the fungus Metarhizium anisopliae included different stages of two important cotton insects, Spodoptera Iittoralis(Boisd) and Agrotis ipsilon(Huf.), under different concentrations of fungus. The fungus proved virulent against eggs and larvae of both insects. Treatment eggs of both insects pests reduced rate of hatchability. It was evident that eggs and larvae of both insects were susceptible to fungul infection, and most of hatched larvae from treated eggs failed to devleop to adults and dead in both S.littoralis and A.ipsilon. LC₅₀ for S.littoralis eggs was 1.7 x 10³ spores/ml and 2.5 x 10³ spores/ml for larvae. LC₅₀ for A.ipsilon eggs was 2.5 x 10³ spores/ml, and 5.5 x 10³ spores/ml for larvae. S.littoralis appeared to be more susceptible than A.ipsilon through all the stages, and recorded more reduction in larvae, pupae, and adults during larval development of the newly emerging larvae from the treated eggs.

Summary in Arabic.

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