Chemical Control of Sorghum Downy Mildew in India. K. H. Anahosur, Pathologist, Department of Plant Pathology, College of Agriculture, Dharwad 580 005, India. S. H. Patil, Research Assistant, Department of Plant Pathology, College of Agriculture, Dharwad 580 005, India. Plant Dis. 64:1004-1006. Copyright 1980 American Phytopathological Society. DOI: 10.1094/PD-64-1004.

Metalaxyl (Ridomil) 25 WP applied as a seed treatment at 1 g a.i./kg of seed and sprayed once 40 days after planting at 1 g a.i./L and 750 L/ha completely controlled both systemic infection and local lesions of downy mildew in sorghum. Infected plants sprayed once with metalaxyl 25 WP at 1 g a.i./L 40 days after planting recovered and produced normal heads. Seed treatment alone with metalaxyl 25 WP and 35 SD at 1 and 2 g a.i./kg of seed provided no protection against late systemic infection on main shoots or nodal tillers or against local lesions on leaves.