Author(s): A. SASMAL, D. K. BHATACHARYA, L. R. NANDA AND U. S. NAYAK

Abstract: An experiment was conducted in Keonjhar, Orissa, India, using rice cultivars Lalat (moderately resistant) and Jaya (susceptible to insect pests). There we are ten treatments, including 3 neem [Azadirachta indica] formulations, i.e. neem seed extract (NSE at 5%), neem oil (NO at 5%) and Multineem (at 0.3%), applied alone or in alteration with chlorpyrifos (at 400 g/ha). The Bacillus thuringiensis (Bt) formulation Halt at 1000 g/ha was also included. The degree of parasitism of yellow stem borer (Scirpophaga incertulas) by Telenomus sp. was determined. Percentage parasitized eggs was relatively higher in plots when NSE, NO and Multineem were applied at 20 and 40 days after transplanting (DAT) or NSE at 20 DAT plus Halt at 40 DAT or Halt at 20 DAT plus chlorpyrifos at DAT, recording 10-20% parasitism compared to 20-24% parasitism in the untreated control and 10-14% parasitism in the recommended IPM practice.

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