Antagonistic effect of crimson clover and woolly pod vetch introduced as winter wheatpost crops on <I>Heterodera glycines</I>
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Crimson clover and woolly pod vetch, which have been recognized as antagonistic plants on <I>Heterodera glycines</I> (SCN) during the spring cultivation, were tested as post crops of winter wheat in a SCN (race 3) infested field in Assabu town, Hokkaido for 70 days from Aug. 12 th. The results obtained from the plot planted with crimson clover showed that the population density of second stage juveniles in the soil was at its peak one month after seeding, and that the number of eggs in the soil decreased to 28% compared with that of preplanting. Susceptible soybean (Bansei-Hikariguro) grown in the following year as an after crop of crimson clover showed a low cyst index and a yield of 216 kg /10 a of dry matter. On the contrary, in the woolly pod vetch plot, no peak of second stage juveniles was observed and egg reduction was not recognized as well as wild oats (<I>Avena strigosa</I>). The cyst index of soybean after crop of woolly pod vetch was high, and yield was 170 kg/10 a. The results of present study indicate that crimson clover effectively inhibited <I>H. glycines</I> (race 3) but woolly pod vetch did not. Jpn. J. Nematol. 34 (1), 31-37 (2004).
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