The objective of laboratory trial presented in this paper were to establish in what measure the NeemAzal-T/S (1% azadirachtin A) insecticide has effect on feeding of Lymantria dispar caterpillars, when it is applied as emulsion of 5%, 10%, 20% and 20% emulsion mixed with 0.1% raps oil or with 1% Bacillus thuringiensis var. aizawai. Antifeedand effect was evident after 72 hours of feeding whit treated leafs, moment which marked by entering of many caterpillars in lethargic state. The antifeedant

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... index (AFI) increased (0.59-0.98) in the same time with increasing concentration of NeemAzal emulsion, and being accentuated by raps oil and Bta added in emulsion. If the application of these emulsions contributes at decreasing of leaf feeding with 74.3-99.3%, we can affirm that the azadirachtin, the active complex of the insecticide, can be utilized in the aim of deciduous forests protection against the gypsy moth.