Evaluation of spinosad as a biopesticide for contolling the jasmine moth; Palpita unionalis Hb. (Lepidoptera : Pyralidae) [electronic resource].

Includes reference.

The toxicity of spinosad to different immature stage of palpita unionalis Hb. (lepidoptera: pyralidae) and its endoparasitoid Apanteles syleptae Ferrriere (Hymenoptera: Braconidae) was under laboratory and field conditions, Data indicated that spinosad had ovicidal activity against eggs of P. uniol1a!is with LC₅₀ of 0.040 ml/l. Spinosad was also toxic to the tested larval instars and mortality was in the order of first instar> third instar > fifth instar with respective LC₅₀ values of 0.019,0,025 and 0,040 ml/l. Moreover, the rate of P. unionalis adult emergence from treated pupae was concentration-dependent and significant differences were existed between spinosad treatments and control. The persistence of spinosad and its residual activity against third instar larvae of P. /lniol1alis were also evaluated, Spinosad showed high persistency under field conditions and mortality rates were 100% up to 5 days after treatment then decreased gradually to reach 32,0% at 45 days post treatment. The LC₅₀ of spinosad was 27.7 days, Regarding toxicity of spinosad to the endoparasitoid A, syleptae, treated cocoons developed to adult stages with no significant difference compared to control. Meanwhile, longevity of the emerged parasitoid adults did not differ among spinosad treatments and control.

Summary in Arabic.

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