Efficacy of Botanicals and Chemicals to Control Cercospora Leaf Spot Disease of Country Bean in Field Condition

摘要

An experiment was carried out at the experimental field of Plant Pathology and Seed Science Department, Sylhet Agricultural University, Bangladesh to estimate the control measure of cercospora leaf spot disease of country bean. Before sowing, the seeds were treated with six different treatments like as T?: Autostin 50 WP, T₂: Aimcozim 50 WP, T₃: Ata leaf extract (1:2 w/v), T₄: Neem leaf extract (1:2 w/v), T₅: Biskatali leaf extract (1:2 w/v) and T₆: Mahogani leaf extract (1:2 w/v). The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. In field condition, similar four leaf extracts and two chemicals were used as spray solution with 1:4 w/v concentrations. The treatment T?: Autostin 50 WP was found to be most effective in controlling seed borne fungi and yield was highest (5.9 t h-1) followed by T₂: Aimcozim 50 WP (5.5 t h-1). The lowest disease incidence (33.3%) and disease severity (21.8%) was found in treatment T?: Autostin 50 WP and gave better response in yield (5.9 t ha-1) compared to other treatments. Among the botanicals extract T₅: Biskatali leaf extract performed bestin case of disease incidence (44.4%), disease severity (25.7%) and yield (5.2 t h-1) The results of the present studies suggested that the use of the chemical Autostin 50 WP and botanical Biskatali leaf extract effectively minimizing Cercospora leaf spot disease severity and increase its yield.