Warmer temperatures can cause a resistant reaction on susceptible plants. Plants are rated as susceptible or resistant 5-7 days after inoculation. The hypocotyl of susceptible plants is girdled or has sunken necrotic lesions. Resistant plants show no reaction or, rarely, a faint water soaked lesion. A sunken lesion develops on the cotyledon of susceptible plants.
Resistant plants show no reaction or a glossy spot where inoculum was applied.
The growing point of susceptible plants is killed and young leaves have necrotic lesions. Resistant plants remain healthy, though some damage to the growing point may occur. Both resistant and susceptible seedlings can be transplanted to steam sterilized soil. Methods 1 and 2. Only resistant plants survive.