Root Knot Nematode of Soybean

— Written By

Ashley Joyce & Lindsey Thiessen | 1/28/2019 | NC State University

Root knot nematode of soybean is caused by plant parasitic nematodes belonging to the genus Meloidogyne. Several species are known to infect soybean including M. incognita (southern root knot), M. enterlobii (guava root knot), M. javanica (Javanese root knot), M. hapla (northern root knot), and M. arenaria (peanut root knot). Southern root knot nematode can be found in abundance throughout North Carolina, and is the most prevalent root knot species in the state. The guava root knot nematode is of new concern to North Carolina producers. The first report of M. enterlobii on soybean in North Carolina occurred in 2013, and has since beenidentified in 8 different North Carolina counties. This nematode species is aggressive, with high rates of reproduction, and overcomes all known host resistance genes. The other nematode species occur at lower frequencies in soybeans throughout the state.

Continue reading for signs and symptoms, diagnosis, disease cycle and management.