Efficiency of some insecticides sequence on cotton bollworms and histopathological effects of some biocides on pink bollworm larvae [electronic resource].

Includes references.

The experiments were carried out during the cotton seasons of 2008 and 2009 in Sakha Agricultural Research Station Farm, Kafr El-Sheikh Governorate to evaluate the efficiency of certain insecticidal sequences against pink and spiny bollworms larvae. The aim of the insecticidal sequences is to get the most effective control one against the bollworms. The data revealed that the infestation of cotton fields with both bollworms in both successive seasons started with few number of 1st and 2nd instar larvae on late July, but increased gradually till the end of each season. In general all treatments had slight and moderate reduction in bollworms where the reduction rates ranged between 34.18 and 52.43%. The sequences of biocides (Spinosad, Azadirachtin and Bacillus thuringiensiS) was efficient in reducing larval population when sprayed three times alone or alternative with other three sprays at 15 days intervals. Spinosad in three successive sprays was the best sequences in controlling bollworms induced 48.66% average reduction, using the conventional insecticides with biocides, IGRs and antimolting compounds caused good average reduction on larval population.

Summary in Arabic.

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