and Pythium spp.)
Symptoms and damage
Above-ground symptoms are
poor growth, thinning of the foliage, and yellowing of leaves, with the oldest
foliage affected first. These symptoms may be one-sided on the plant. Wet rots
cause a soft decay of the outer layers of roots, which can be easily stripped
off between two fingers, leaving the firm, white stele intact.
COMMENTS on disease
The disease is triggered by periods of excessive soil moisture.
Conditions that favor disease development include planting too deep, poor
drainage, shallow rooting, and poor water management.
Check roots of nursery-grown
plants before planting into the landscape. Provide adequate drainage, and
reduce irrigation. Apply labeled fungicides if problem is diagnosed early and
cultural problems corrected.