9-1-7 MANAGEMENT OF YELLOW VEIN MOSAIC VIRUS (YVMV) THROUGH ACmix INSECTICIDE SPRAY AT DIFFERENT GROWTH STAGES OF OKRA


Md. Hasibur Rahman, Md. Belal Hossain, F. M. Aminuzzaman, Md. Shariful Islam, Suraiya Jitu

Corresponding Author e-mail: mbhossainsau@yahoo.com/ dr. mbhossain@sau.edu.bd


Abstract

A field experiment was conducted at the Field Laboratory, Department of Plant Pathology, Sher-e- Bangla Agricultural University, Dhaka-1207, during March to July, 2016 to evaluate the performance of ACmix against Yellow vein mosaic virus (YVMV) of okra. The variety ‘green finger’ was used. The treatments were T0 (control/no spray), T1 (1 spray), T2 (2 sprays), T3( 3 sprays), T4( 4 sprays), T5 (5 sprays), T6(6 sprays). The insecticide was sprayed at 20 DAS and continued with 5 days interval. In case of insecticide application in six treatments, the lowest percent disease incidence was recorded in T6 (15.98%) at 95 DAS. The highest percent disease incidence was found in T0 (88.21%). In case of morphological parameters; number of leaves, flowers and fruits per plant was recorded in T6 (50.00, 29.00, 28.33 respectively) up to last harvesting. In case of yield and yield contributing characters significant variaTION was observed among the treatments. The highest yield per plant and also per plot was recorded in T6 (6 sprays) treatment (0.83kg/plant, 15.44 kg/plot). The highest plant height was recorded in T6 (6 sprays). In case of physiological features the highest chlorophyll content was measured in T6 (57.93 μ mol m-2s-1). Plant height and yield showed the positive relationship with chlorophyll content and percent disease incidence showed negative relationship with chlorophyll content. It was also observed that when percent disease incidence increased, the yield of okra was also decreased. However, considering the economic conditions/cost-benefit ratio T4 (4 sprays) was the best in case of all measuring parameters.

Keywords: Okra, YVMV, Whitefly, Management, ACmix



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