Effect of Trichoderma harzianum and Selected Botanicals on Brown Leaf Spot of Paddy (Oryza sativa L.) Caused by Helminthosporium oryzae (Breda de Haan)

Paddy or rice crop (Oryza sativa L.) is the most important cereal crop next to wheat in area and production. The present study was investigated to evaluate the effect of Trichoderma harzianum and selected botanicals on brown leaf spot of Paddy (Oryza sativa L.) caused by Helminthosporium oryzae (Breda de Haan) under field condition. Three replications of paddy were planted in a randomized block design at the research plot of the Central Research Field, Department of Plant Pathology, Sam Higginbottom University of Agriculture, Technology And Sciences, Prayagraj during Kharif season of 2023. The minimum per cent disease intensity was recorded in T5- Trichoderma harzianum @ 0.1% (S.D) + Garlic bulb extract @ 10% (F.S) (33.06) followed by by Trichoderma harzianum @ 0.1% (S.D) + Neem leaf extract @ 10% (F.S) (37.81). Maximum plant height 102.34 (cm), number of tillers (27.00), panicle length 20.91 (cm), and yield (5.13 t/ha) were recorded in Trichoderma harzianum @ 0.1% (S.D) + Garlic bulb extract @ 10% (F.S) whereas maximum cost benfit ratio (1: 2.67) was recorded in T1- Trichoderma harzianum @ 0.1% (S.D) + Neem leaf extract @ 10% (F.S) when compared to untreated check.