Damping-off, Rhizoctonia solani , Pythium spp. Seedlings either rot and do not germinate or germinate and collapse. The disease frequently attacks the base of the seedling and leaves a shriveled dried-up stem at the base of the seedling. Control can be achieved by using sterile potting media, clean pots, and fungicide-treated seed. If seeds in a seed tray become symptomatic, discard all of the seeds since asymptomatic seeds may be infected.
Symptoms appear as wilting and a slow or rapid collapse of the plant.
The roots can appear brown and water-soaked instead of white. A water-soaked lesion can often appear at the base of the stem. Control can be achieved by using sterile potting media, clean pots, and fungicide-treated seed. Affected plants should be rogued out and discarded. Botrytis blight , Botrytis cinerea.