Brown spot

Caused by: Septoria glycines
Problem Category: Fungal Disease
Symptoms: Upper leaves have light purple discoloration and a leathery appearance and bronzing of leaves may occur; red-purple angular or irregularly shaped lesions develop on both the upper and lower leaf surfaces and may coalesce to form large necrotic patches; multiple infections can cause chlorosis and defoliation of the plants; on petioles and stems, sunken red-purple lesions may develop and upper leaves appear blighted.
Comments: Disease emergence favors warm, wet weather which promotes sporulation of the fungus; dry weather prevent the spread of the disease
Management: Plow crop residue into soil after harvest; plant soybean varieties that are less suceptible to the disease; rotate crops to a non-susceptible crop for at least one year; apply cowdung + asafoetida to protect plants from bloom to pod fill
Control: spray 2 times 10% Cowdung+Asafoetida solution in 10 days interval to control the spot