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The Efficiency of feeding stimulants (Bioenhencer) was studied alone and in combinations with chemical insecticides or entomopathogens against the defoliating pests, Spodoptera littoralis (Boisd.) and Spodoptera exigua Hbn. (in fields of cotton and soybean) and the bollworms Pectinophora gossypiella Saunders and Earias insulana Boisd. (in cotton field), at Kafr El-Sheikh governorate during the season 2003. Its adversely influence on the natural enemies associated these pests in the two fields, were also undertaken. Laboratory results indicated that the feed stimulant was exhibited at a high degree of efficiency against the target lepidopterous larvae when combined with the chemical insecticide and the bioinsecticides. But no obvious effect was found when it was used alone. Field results indicated that, the addition of Bioenhencer (5%) to the chemical and bio insecticides enhanced their activity, where the damaged rate significantly affected in these treated plots as compared to the untreated ones, on both cotton and soybean fields. Moreover, bioenhancer and the bioinsecticide had the least harmful effect on the entomophagous insect populations. @JASEM Massive applications of insecticide result in adverse effects on beneficial organisms, leaves their residues

journal of applied sciences and environmental management

Evaluation of Feeding Stimulant Mixed with Chemical and Bio Insecticides on Certain Lepidopterous Pests and their Natural Enemies in Cotton and Soybean Fields