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The naturally occurring pesticides thus appear to have a prominent role in the development of future commercial pesticides not only for agricultural and forestry crop productivity but also for the safety of the environment and public health. The harmful environmental implications of the synthetic chemicals like the development of insect resistance, distribution of natural enemy complex and increased contamination have compelled to search for some alternative methods. This lead to increased development of compounds based on the models of naturally occurring toxins of biological origin, having various biological activities. This includes plant extract and microbes which are now known because they are environmentally harmless, host specific and less residual. These different concentration of plant extracts viz. Azadirachta indica seed extract / cake, Jatropha curcas leaf extract / cake, Pongamia pinnata leaf extract/ cake, Aloe vera leaf extract, Annona sqamosa leaf extract, Calotropis procera leaf extract, Vitex negundo leaf extract were tested for their feeding inhibition properties against six major forest insect pests in laboratory and field condition and the most effective concentration has been worked out. Similarly, the different doses of three toxins of thuricide (Bacillus thuringensis) have also been tested against some forest insect pests and their efficacy has been compared.
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