Rootknotnematodes typically have a very broad host range, which limits the efficacy of crop rotation as a management tool. Some crops have become non-hosts of M. incognita due to resistance genes that have been introduced via breeding. In this video, I’ll share how I went from finding rootknotnematode damage on my sweetpotatoes last summer to a clean soil test from the UF IFAS Nematode Assay Lab in a single growing season. Symptoms of SweetPotatoRootKnotNematodes. Rootknotnematodes of sweetpotatoes are white to yellow and live amongst the storage roots. Although tiny, these nematodes can be seen without a magnifying glass. Root-knotnematode, Meloidogyne spp., is widely distributed throughout the world and can cause significant damage, especially in sandy soils.On the feeder roots, the nematode induces galls that tend to be smaller on sweetpotatoes than on many other crops. The sweetpotato cultivar 'Koganesengan' is susceptible to damage by the southern root-knotnematode Meloidogyne incognita in Japan.Efficient evaluation of resistance to three root-knotnematode species in selected sweetpotato cultivars. Sweetpotato - guava root-knotnematode. At first, guava was seen as a common host in China at the time when the nematode was first identified, hence the name. Five species of root-knotnematodes (RKNs), Meloidogyne spp. (M. haplanaria, M. incognita, M. floridensis, M. javanica, and M. arenaria), were detected in 67% of vegetable-growing regions in Georgia, United States (Marquez and Hajihassani 2022, 2023). The root-knotnematode (RKN) Meloidogyne enterolobii is gaining importance all around the world, including Brazil, damaging sweetpotato genotypes with known resistance to other RKN species, making it challenging to generate new resistant genes. Subsequently, in 2022, root-knotnematode infections of sweetpotato by M. enterolobii was also reported in Guangxi province, China (15). Guangxi Province is the largest sweetpotato producer in south China and the third top producing region in the whole country. Other Root-KnotNematodes in Sweetpotato Storage Roots.Abstract 12. Meloidogyne enterolobii is an aggressive root-knotnematode (RKN) species that has emerged as 13. a significant pathogen of sweetpotato in the Southeastern United States.
