EFFICACY OF BOTANICALS AND CHEMICALS TO CONTROL CERCOSPORA LEAF SPOT DISEASE OF COUNTRY BEAN

Abstract

The experiment was carried out at the experimental field and laboratory condition of Plant Pathology and Seed Science Department, Sylhet Agricultural University, Sylhet to estimate the prevalence of seed-borne fungal pathogens of country bean and their control measure. In laboratory, different fungal pathogens like Aspergillus niger, Cercospora sesami, Rhizopus stolonifer, Alternaria sp. and Fusarium oxysporum were detected from the collected seed sample by blotter test method. Before sowing, the seeds were treated with six different treatments like as Tı: Autostin 50WP, T2: Aimcozim 50WP, 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). 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 50WP was found to be most effective in controlling seed borne fungi.The lowest disease incidence (33.3%) and disease severity (21.8%) was found in treatment Tı: Autostin 50WP and gave better response in yield (5.9 t ha-1) compared to other treatments. The results of the present studies suggested that the use of the Autostin 50 WP effectively minimizing Cercospora leaf spot disease severity and increase its yield.