Cause: 

• The fungus Phialophora gregata

Symptoms:

• Interveinal chlorosis leading to necrosis, very similar to SDS
• Leaves turn brown & dry, curl, remain attached to petioles
• Browning of vascular system at nodes &/or lower stem
• Cool pod fill followed by hot/dry will amplify symptoms

Infection:

• Fungus enters through roots/lower stem early in the growing season
• Upward growth within the xylem, inhibiting water & nutrient flow
• Disease infected plants begin to show signs 10-30 days prior to harvest

Management:

• Pathogen overwinters in soybean residue
• Select tolerant varieties for areas with BSR history
• Crop rotation to give residue time to break down
• Manage Soybean Cyst Nematode numbers