Influences of a radish and sweet potato continuous ridge use system on root-knot nematode damage to sweet potato

摘要

The influences of continuous ridge use (CRU) on root-knot nematode (RKN) damage to sweet potato was investigated in a double cropping system that uses radish in winter and sweet potato in summer. The CRU system tended to show reduced RKN damage to sweet potato relative to the conventional system (TR system), in which the field was tilled and ridged before sweet potato cultivation. RKN population density after the radish harvest was low in the upper area of the ridge in both the CRU and the TR systems. In the TR system, density in the upper area of the ridge was slightly increased after tillage and ridging. Low density in the upper area of the ridge is suggested as one of the reasons for the decrease in damage to sweet potato in the CRU system. Adoption of the CRU system would be one method of reducing RKN damage to sweet potato. Nematol. Res.