Description: Plants
are stunted with yellow, red, or purple leaves. Dark brown to black lesions
occur on tap roots. Frequently the lower portion of the tap root is rotted off
immediately below the crown region. Phytophthora also causes damping off, with
seedlings failing to emerge or collapsing at the soil surface.
Location: Phytophthora root rot occurs throughout Ohio. It is especially
severe on heavy, poorly-drained soils. Symptoms are frequently seen in low areas
or between tile lines, while plants in drier areas appear healthy.
Time of Attack: Infection can occur any time the soil is water-saturated.
Management:
· Resistant varieties
· Seed treatment
· Improve soil drainage