Sustainable Vegetable Growing : How to Control Injury of Nematodes by Cropping System(Sustainable Horticulture, For Further Development of Horticulture in East Asia)

Abstract

In Japan, vegetables are often grown in continuous cropping. One of the important problems in this condition is the harm by the nematodes. Taro (Colocasia esculenta Schott.) is severely damaged by a root lesion nematode (Phratylenchus coffeae). Introduction of the new finding, "peculiar nematode maintained density", into crop rotations makes it possible to predict the efficiency of crop sequence in controlling nematodes and provides wider range in selecting crop combination. Taro is affected not only by P. coffeae but also by root knot nematode (Meloidogyne incognita) while radish (Raphanus sativus L.) is attacked by root lesion nematode (Phratylenchus penetrans). The combination of these two vegetable crops and a third one, such as vegetable soybean (Glycine max), can minimize the injury of these three nematodes.