Comparative efficacy of neem oil and lambdacyhalothrin against whitefly (Bemesia tabaci) and jassid (Amrasca Devastans Dist.) in okra field
2015
Hafeez-ur-Rahman, | Nadeem, Muhammad | Ayyaz, Mahmood | Begum, Husn Ara
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) reduction in population was recorded after 48 and 72 hours respectively. The decline in efficacy of insecticides were recorded after 360 hours of spray. Lambdacyhalothrin and neem oil @ 4 and 5% concentration were equally effective against whitefly and jassid feeding on okra plants. The efficacious effect of neem oil and synthetic insecticide on plant height, number of pods/plant and yield were also studied. Furthermore, tested treatments had no significant effect on plant height and yield parameter (number of fruits pods plant⁻¹). Whereas, tested treatments of neem oil @ 4 and 5% and lambdacyhalothrin had induce significantly (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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