EVALUATION OF DIFFERENT BIO-AGENTS AND BOTANICALS AGAINST LEAF CURL DISEASE OF CAPSICUM (Capsicum annuum)

Abstract

A filed experiment was conducted in central farm of Sher-e-Bangla Agricultural University and lab experiment was conducted for multiplication of selected bioagent

in lab of Department of Plant Pathology, Sher-e-Bangla Agricultural University, Dhaka during the period from July, 2020 to June, 2021. The study was carried out to evaluate the suppressive effects of selected endospheric bio-agents viz. Trichoderma harzianum, Trichoderma viride, Metarizium anisopliae, Verticilium lecanii, Bauveria bassiana and botanicals namely Neem, Nishinda, Bhat and Lantana leaf extracts for management of Pepper leaf curl virus (PeLCV). In response to different selected treatments, percent disease incidence and disease severity on the basis of visible symptoms, analysis of chlorophyll contain in diseases and healthy leaves, yield and yield attributes were recorded. An encouraging performances was observed in reducing the disease intensity in terms of plant infection and appearance the visible symptoms in leaves in comparison to manage at 25, 55, 85 days after transplanting (DAT) which was after 7 days of treatments application. Among the selected endospheric bio-agents, the lowest disease incidence and severity was found in T 7 (Verticilium lecanii) treatment followed by T 9 (Bauveria) and the highest in T 6 (T. viride) treatment. Among the selected botanicals, the lowest disease incidence and severity was found in T 1 (Neem leaf extract) and the highest was found in T 4 (Lantana leaf extract). The chlorophyll contain was tested based on visible symptoms in the field conditions. From the results, it was found that among the treatments, the highest chlorophyll contain was recorded in T 4 treatment (Lantana, 2.23 X 10 -03 and 5.52 X 10 ) and the lowest chlorophyll contain in T 1 treatment (Neem, 0.51 X 10 -03 03 ) in case of both types of samples. The effect of different treatments on yield and yield contributing characters also studied and significance variation was observed. From the findings of the present study, it may be concluded that bio-agent, Verticilium lecanii or Bauveria and botanical, Neem or Bhat leaf extracts can be used as ecofriendly approach for management of Pepper leaf curl virus (PeCLV). However, further investigation is needed to justify the present findings.