Light to dark gray or brown areas varying from specks to large blotches appear on seeds. The disease primarily affect foliage, but, stems, pods and seeds may also be infected. Leaf lesions are circular or angular, at first brown then light brown to ash grey with dark margins. The leaf spot may coalesce to form larger spots. When lesions are numerous the leaves wither and drop prematurely. Lesions on pods are circular to elongate, light sunken and reddish brown. Management Use healthy or certified seeds. Rotate soybean with cereals. Completely remove plant residue by clean ploughing the field soon after harvest. Seed treatment with Thiram + Carbendazim (2:1) @ 3g/kg seed. Spray Mancozeb @ 2.5g/lit or Carbendazim 1g/lit.
Light to dark gray or brown areas varying from specks to large blotches appear on seeds.
The disease primarily affect foliage, but, stems, pods and seeds may also be infected.
Leaf lesions are circular or angular, at first brown then light brown to ash grey with dark margins.
The leaf spot may coalesce to form larger spots.
When lesions are numerous the leaves wither and drop prematurely.
Lesions on pods are circular to elongate, light sunken and reddish brown.
Use healthy or certified seeds.
Rotate soybean with cereals.
Completely remove plant residue by clean ploughing the field soon after harvest.
Seed treatment with Thiram + Carbendazim (2:1) @ 3g/kg seed.
