Evaluation of Selected Fungicides Against Late Blight of Potato Caused By Phytophthora infestans

Abstract

Late blight (Phytophthora infestans), the most devastating disease of potato, was found prevalent in all the potato growing areas of the world. The pathogen infected all parts of the plant and caused premature death of the entire plant. In the present study, fungicides of various number of application were evaluated to manage the devastating disease of potato. The fungicide applied in the field were Indofil, Metaril, Secure and Cabrio top. The study was conducted in the Plant Pathology research field of Hajee Mohammad Danesh Science and Technology University during 2022-2023 cropping season. The application of fungicides resulted in the lesser late blight development in comparison to control. Late blight disease severity (DS) was lowest in Secure (4.33%) at 80 DAS where is given triple application followed by Cabrio Top (6.66%) and Indrofil M (6.33%) Fungicides application proved very effective in controlling late blight of potato and also delayed the initial symptom development. Application of Secure with three times apply showed the highest plant height, increased number of stem compared to non-treated control plant as well as less number of application of other fungicides. Comparatively the less percentage of disease incidence (DI) was also recorded in all the fungicide treated plant. Maximum amount of A and B grade tuber was collected from three times fungicide treated plot and that was minimum in control plot. Highest yield was obtained in Secure (19.09 ton/ha) followed by Indofil M (17.77 ton/ha) where was also given triple application. The findings of the study suggest applying Secure with its three times application to control late blight of potato for showing significantly lowest disease prevalence and higher yield.