Area of impact: Leaves and pods
Description: Infected seeds might not germinate; infected seedlings display dark sunken cankers that cause damping-off. In mature plants the disease develops brown cankers that cause defoliation. Pods and stems might show irregular brown spots and pods have reduced or smaller seeds per pod. Infected areas might also be covered with tiny black spines that can be seen with a hand lens.
Pathogen involved: Colletotrichum truncatum Glomerella glycines and other fungi
Timing/Conditions: Can occur all season long but is more likely in warm moist weather
Contributing factors: Overwinters in infected crop residue and seeds
Management practices: Use resistant varieties or treat infected seeds with a fungicide.