Abstract
The potentials of planting of Trifolium spp. and applying dried cattle feces in suppressing the population of Heterodera glycines were evaluated in a two-field-microplot experiment. Planting of T. pretense or T.incarnatum for four months reduced the H. glycines egg population density by 65-75% against the preplanting treatment and by 50% against the nonhost-crop planting treatment. The highest suppressive effect was obtained when T. pretense was sown early in May. The application of dried cattle feces 300kg/10 a in soil did not cause significant suppression of the population of H. glycines. Planting of Trifolium spp. once a year was not sufficient in reducing the final H. glycines egg population to the economic threshold level when the initial population was high.
