EVALUATION OF SELECTED BOTANICALS EXTRACT AND BAU- BIOFUNGICIDE AGAINST CERCOSPORA LEAF SPOT OF LETTUCE

Abstract

The study was conducted to evaluate selected botanicals and BAU- biofungicide against Cercospora leaf spot of lettuce in the Central Farm of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during October, 2019 to February, 2020. Seven botanicals namely Allamanda leaf extract (1:3 w/v), Garlic clove extract (1:3 w/v),

Neem leaf extract (1:3 w/v), Onion bulb extract (1:3 w/v), Lantana leaf extract (1:3 w/v), Turmeric rhizome extract (1:3 w/v), Mint leaf extract (1:3 w/v) and BAU- biofungicide (1ml/L) were applied including a control. At different days after transplanting (DAT), BAU- biofungicide and all botanicals significantly showed the minimum disease severity (1.17%), minimum plant disease incidence (15%) with increased yield (47.82%) of lettuce. However, the highest disease reduction with maximum yield and yield components were recorded in BAU- biofungicide applied plot followed by Neem leaf extract and Allamanda leaf extract. The BAU- biofungicide most effective against Cercospora leaf spot of lettuce compare to other treatment used in this experiment.