1Department of Entomology, Faculty of Agriculture, Hajee Mohammad Danesh Science and Technology University, Dinajpur5200, Bangladesh
*Corresponding Author: Md. Alamgir Hossain, Department of Entomology, Faculty of Agriculture, Hajee Mohammad Danesh Science and Technology University, Dinajpur5200, Bangladesh. Email: alamgirhstu@gmail.com, alamgir@hstu.ac.bd
Okra (Abelmoschus esculentus) is a nutrient-rich vegetable widely grown in Bangladesh, supporting rural and low income diets. Its production, however, is severely affected by the okra jassid, Amrasca biguttula Ishida (Homoptera: Jassidae).
A field trial was conducted in RCBD to evaluate the efficacy of four novel insecticides on BARI Dherosh-2. Treatments included T1= Buprofezin 40% SC @ 0.4 ml L-1, T2= Spinosad 2.5% SC @ 0.4 ml L-1, T3= Lufenuron 5% EC @ 0.5 ml L-1, T4= Spinetoram 11.7% SC @ 0.3 ml L-1 and an untreated control.
Spinetoram consistently recorded the lowest jassid populations (2.68, 3.06 and 3.07/3 leaves/plant) after the 1st, 2nd and 3rd sprays, at 10-day intervals while the control had the highest (7.90, 9.68 and 11.40/3 leaves/plant). Corresponding reductions over control were 66.07%, 68.39% and 73.07%. Spinetoram (T4) also produced the highest cumulative yield (3.96 kg/plot) with a 97.93% increase over control and the greatest benefit-cost ratio (2.76). Therefore, Spinetoram 11.7% SC @ 0.3 ml L-1 is an effective and promising option for managing okra jassid and enhancing okra production.
BCR, Management, Newer insecticides, Okra jassid, Yield
