A network that helps people worldwide obtain rapid advice and information on crop protection, including the identification and management of plant pests.
PestNet is a network that helps people worldwide obtain rapid advice and information on crop protection, including the identification and management of plant pests. It started in 1999. Anyone with an interest in plant protection is welcome to join. PestNet is free and is moderated, ensuring that messages are confined to plant protection.
Crops > Roots & tubers > Sweet potato > Nematodes > Root knot gall on sweet potato, New Caledonia
April 2012. Sweet potato roots in New Caledonia grown in rather sandy soil showed galls on the surface. what are they?
The concenus among members was that the galls were those of the root-knot nematode, Meloidogyne sp. However, the common species do not cause galls on sweet potato as shown in the image. Even on the roots they produce only slight swellings, which are not always detectable. Symptoms can differ with different nematode species and different vareties of sweet potato. Slicing through the root tissues should show the swollen, round female nematodes with the naked eye although staining with acid fuchsin or methyl blue will make it easier. If nematodes are producing the large galls on tubers in your photo, you should find many swollen females in each gall.