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

Abstract

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 Tı: 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 Tı: 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 Tı: 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.