What is Pea Aphanomyces Root Rot?
Aphanomyces root rot of peas, sometimes also called common root rot, is a disease caused by the fungus Aphanomyces euteiches. It can be very devastating to pea crops. It lives in the soil, and symptoms are rarely seen above the soil line unless conditions are very damp or the infection is severe. When young seedlings are infected, they die quickly. When larger pea plants are infected, they usually grow poorly and have trouble forming seeds. Plant tissue often becomes soft, water soaked, and slightly discolored. Outer roots surrounding the taproot may fall off.
What Causes Pea Aphanomyces Disease?
Pea aphanomyces root rot will thrive in all temperatures at which pea plants grow, though it spreads more quickly in warmer weather. It prefers wet conditions. Spores of the fungus enter the soil through broken down plant tissue and can remain dormant for years.
How to Treat Peas with Aphanomyces Root Rot
Aphanomyces root rot can often be combated by liberal fertilization – if roots are encouraged to grow fast and healthily, they should be able to outstrip the decay of the disease. Nitrogen can be applied to suppress the spread of the fungus. Since the fungus thrives in wet conditions, the most important aspect of prevention is good drainage. It’s a good idea to rotate pea crops at least every three years. If your garden has experienced a particularly damp growing season, add another year or two to your rotation to give the spores time to die out.
