Abstract
The present study was conducted to investigate the comparative efficacy of neem leaf extracts and lambdacyhalothrin against whitefly and jassid in okra field. Four okra cultivars (SABZ PARI, SADA BAHAR, PUS A SAWANI, ARKA and ANAMIKA) were grown in field with four replication. Five neem oil concentrations (1, 2, 3, 4 and 5 percent) and a synthetic insecticide (Lambdacyhalothrin 2.5EC) @ 330 mL acre−1 were applied to evaluate efficacy effects on targeted insects population. Distilled water was used as control. The plots treated with synthetic insecticide and the leaf extracts against targeted pests had significantly (P > 0.05) suppressed insect population as compared to control. After 1st spray, no significant (P > 0.05) reduction in pest populations were observed after 24 hours. However, significant (P 0.05) impact on yield parameter (yield). We conclude that Lambdacyhalothrin and neem oil @ 4 and 5% concentration are equally effective in controlling jassid and have same impact on yield of okra plant.
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