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Expression of insect resistance in crop plants is being influenced and / or induced by external factors, especially the nutrient sources. Many bio-inoculants as nutrient sources influence insect resistance in crop plants. Hence, an attempt was made to study the influence of arbuscular mycorrhizae and other bioinoculants in influencing insect resistance in sesame, Sesamum indicum Linn. against Antigastra catalaunalis Duponchel (Lepidoptera: Pyraustidae). The five promising accessions sown in field plots were applied with the four bioinoculants and for comparison, recommended dose of inorganic fertilizers, NPK was supplied in a separate plot besides maintaining a untreated control plot without any nutrition. The damage caused by A. catalaunalis to leaves, flowers and capsules and seed yield at harvest were recorded. Among the accessions tested, IVTS 2001-26 recorded the minimum damage by A. catalaunalis. Irrespective of the accessions, Azospirillum applied plants recorded the minimum leaf damage while flower damage was least in farm yard manure applied plants. Capsules of plants applied with either Azospirillum or farm yard manure were undamaged. Seed yield was the highest in inorganic fertilizer applied plants. Hence, it is concluded that bioinoculants increase host plant resistance as well as yield compared to with inorganic fertilizers.
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