Control of Heterodera glycines
Crop rotation experiments for soybeans were carried out in China in order to investigate their effect on the infestations of soybeans by Heterodera glycines (EPPO A1 quarantine pest). As reported at the 6th International Congress of Plant Pathology in Montreal, maize, millet and castorbean (Ricinus communis) were grown on a heavily H. glycines infested field preceding a crop of susceptible soybeans. It was found that the average amount of cysts per soybean plant was markedly decreased and the soybean yield was greatly increased when castorbean had been cultivated as a preceding crop. Laboratory experiments showed that the root diffusates of castorbean induced a hatching of the eggs of H. glycines. The juveniles died soon after the hatching due to the absence of host plants. The authors concluded that the cultivation of castorbean as a predecessor crop of soybean can control the soybean cyst nematode effectively.
Sources
Ye, L.; Weizhi, L.; Yuxi, D. (1993) Effects of castorbean and other nonhost crops on controlling Heterodera glycines.
Presentation at the 6th International Congress of Plant Pathology, Montreal, CA, 1993-07/08-27/06.