Damping off—Pythium spp. and Rhizoctonia solani
In plants infected with the Pythium or Rhizoctonia fungus seeds rot and young seedlings damp off. Symptoms
include water-soaked or reddish brown lesions with the eventual collapse of the hypocotyl at or below
ground. Occasionally, older plants are infected and develop water-soaked lesions that extend some distance
up the stem, causing a linear band of dead cortical tissue. Girdling of the stem and eventual death may
a temperature and at a date optimum for the plant and in soil that is moist but not overly
wet is the first line of defense. Prepare raised planting beds so that the soil has good drainage. Plant
shallow to minimize exposure of susceptible areas of the hypocotyl. Use light sprinkler irrigations to
encourage germination and emergence, but do not overwater.
For more information, see the Damping -off Diseases in the Garden Pest Note.
seeds caused by Pythium
lesions of Rhizoctonia