Brown Stem Rot
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
Reach out to your local AgriGold Key Account Specialist or AgriGold Agronomist if you have questions.