Efficiency of selected botanicals Alternaria leaf spot (Alternaria sp.) on cluster bean (Cyamopsis tetragonoloba L.)

Abstract

The study was conducted during the Zaid season 2023 at the Central Research Field, Department of Plant Pathology, SHUATS, Prayagraj, U.P. Leaf spot of cluster bean is caused by Alternaria sp. It is one of the major constraints in the production and most trouble some foliar disease affecting all aerial portions of plants. Seven different botanicals treatments are applied as foliar spray viz, Onion bulb extract, neem leaf extract @ 20%, giant milk weed extract @ 20%, famine milk weed extract @ 20%, Lantana camara extract @ 20%, Eucalyptus globules extract @ 20%, mancozeb @ 0.2% and along with untreated check were evaluated against the leaf spot. All the treatments were found to significantly reduce the severity of the disease and increase yield. Among all the treatments onion bulb extract @ 20% were significantly superior over the other treatments in reducing Alternaria leaf spot intensity and also increasing in growth, yield and cost benefit ratio, as compared to treated check mancozeb @ 0.2% and untreated check.