Effect of Plant Extracts against Alternaria Leaf Spot (Alternaria alternata) (Fr.) Keissler of chilli (Capsicum annuum L.)

Chilli (Capsicum annuum L.) is one of the most important vegetables in the world, Alternaria leaf spot caused by Alternaria alternata is one of the major diseases of chilli worldwide. It is responsible for causing up to 10-15 % yield losses in chilli. An experiment was conducted using Nilgiri leaf extract, Lemon grass leaf extract, Neem leaf extract, Datura leaf extract and Lantana camara leaf extract and Mancozeb were tested against Alternaria leaf spot (Alternaria alternata) (Fr.) keissler under field condition during Rabi season 2023. Among all treatments, neem leaf extract@10%FS was found highly effective in showing the minimum disease intensity (%) with (18.51%) followed by nilgiri leaf extract @10%FS (20.07%). The maximum plant height (cm) (37.14cm) were found in neem leaf extract @10%FS followed by nilgiri leaf extract @10%FS (35.55cm) , highest number of leaves were found in neem leaf extract @10%FS with (41.66) followed by nilgiri leaf extract @10%FS (40.43) and highest yield (t/ha) of chilli were found in neem leaf extract@10%FS (3.78t/ha)followed by nilgiri leaf extract @10%FS (3.26t/ha) compared to untreated check and treated check (Mancozeb) @0.2%FS and C:B ratio is highest in neem leaf extract @10%FS(1:4.0) followed by nilgiri leaf extract @10%FS (1:3.4).