Nemathode attack

Typical root symptoms indicating nematode attack are root knots or galls, root lesions, excessive root branching, injured root tips and stunted root systems. Symptoms on the above ground plant parts indicating root infection are a slow decline of the entire plant, wilting even with ample soil moisture, foliage yellowing and fewer and smaller leaves. Nematodes produce stem swellings and shortened internodes.

Field symptoms usually consist of severe stunting, wilting, yellowing, and sometimes death. Infested areas consist of spots that vary in size and shape, but the boundary between diseased and healthy plants usually is fairly well defined.



Healthy potato using microbial insecticide and microbial nemathode, Karo, North Sumatera
Yields of potato in Karo, North Sumatera