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Laboratory selection for resistance to spinosad in the cotton leafworm, Spodoptera littoralis (boisd) [electronic resource].

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Kandil, Mohamed A

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Description: p.191-199Uniform titles:

Bulletin of the entomological society of Egypt (A.R.E.), Economic series, 2004 v. 30 [electronic resource].

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In: Bulletin of The Entomological Society of Egypt (A.R.E.), Economic Series 2004.v.30Summary: Laboratory selection was carried out to develop resistance of cotton leafworm to spinosad insecticide. Two field strains from Gharbia (Gh) and Fayoum (F) were subjected to selection pressure. The results obtained are summarized as follow: 1- Testing the susceptibility of the different instars against a susceptible laboratory strain showed that spinosad exhibited high activity to the 1 st and 2nd instars of cotton leafworm larvae. 2- Laboratory selection pressure applied for Gh and F strains with spinosad led to reasonable level of resistance to this compound after 20 selection generations. The RR of Gh and F selected strains reached 38 and 30 at the LC₅₀ level. 3- Release of selection pressure for four generations decreased the RR values of the selected Gh and F strains to ca. 11 and 9 after four relaxed generations. 4- No cross-resistance was detected to any of the tested conventional insecticides.

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Laboratory selection was carried out to develop resistance of cotton leafworm to spinosad insecticide. Two field strains from Gharbia (Gh) and Fayoum (F) were subjected to selection pressure. The results obtained are summarized as follow: 1- Testing the susceptibility of the different instars against a susceptible laboratory strain showed that spinosad exhibited high activity to the 1 st and 2nd instars of cotton leafworm larvae. 2- Laboratory selection pressure applied for Gh and F strains with spinosad led to reasonable level of resistance to this compound after 20 selection generations. The RR of Gh and F selected strains reached 38 and 30 at the LC₅₀ level. 3- Release of selection pressure for four generations decreased the RR values of the selected Gh and F strains to ca. 11 and 9 after four relaxed generations. 4- No cross-resistance was detected to any of the tested conventional insecticides.

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