Estimation of Yield Losses for Major Diseases (late leaf spot) in High Incidence Areas on Groundnut (Arachis hypogaea L.)

Abstract

Late leaf spot (LLS, Phaeoisariopsis personata L.) is the major biotic constraint of groundnut (Arachis hypogaea L.) productivity in hot spot location in Maharashtra, India. The aim of this study was to determine the yield losses due to attack of diseases, with and without using the fungicide tebuconazole. Management of LLS through fungicides was evaluated with eight treatments in randomized block design with three replications during Kharif, 2021, 2022 and 2023 at Oilseed Research Station, Jalgaon, Maharashtra, India. Fungicidal spray impacted the development of Cercospora late leaf spot and reduced the disease intensity. No pod or haulm loss was observed when tebuconazole was sprayed at 25.9 EC (T4) at 50, 65, 80, and 95 DAS when compared to control treatment (T8), which showed losses of 35.95 % and 29.46 % respectively. It was followed by treatment T3 i.e. tebuconazole 25.9 % EC at 50, 65 and 80 DAS and treatment T5 i.e. Tebuconazole 25.9% EC at 65, 80 and 95 DAS. The pod and haulm yield loss in treatment T5 was 9.10% and 9.46%, respectively. The highest BCR was recorded by treatment T4 (4.67), followed by treatments T5 (4.51) and T3 (4.47), respectively. The results indicated that the use of fungicide significantly influenced disease management and, consequently, yield.