Some pulse pastures, green manures and flowers of legumes were researched about hatching effect for soybean cyst nematode (SCN). If eggs or cysts soaked in the roots extracts, hatching of eggs were activated in the extracts of soybean, azuki bean kidney, bean, red clover, white clover, sweet pea, lupin, Chinese milk vetch and sunn hemp. The cysts contained few no-hatching eggs in the extracts of Chinese milk vetch and sunn hemp. These results were considered that Chinese milk vetch and sunn hemp actuated hatch of eggs and cysts. If cysts were buried in pots cultivating each plant, the cysts contained few no-hatching eggs in the pots of soybean, azuki bean, kidney bean, white clover, red clover, sunn hemp and Chinese milk vetch.
SCN cannot be parasitic on sunn hemp, but can multiply on Chinese milk vetch. Those results suggested that sunn hemp had a possibility of applying for prevention of SCN by hatching effect.
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