2010 Volume 64 Issue 2 Pages 95-100
The effects of boiled extracts of Bidens pilosa var. radiata on the control of Meloidogyne incognita and soil microflora in three differing Okinawan soils (Kunigami mahji, Shimajiri mahji and Jyagaru) were evaluated. In all soil types, root-knot formation and the population density of M. incognita were highly suppressed. In addition, the above-ground tissues of tomato plants grown in all three soils treated with a stock solution of B. pilosa extract increased significantly. The plant extracts did not have an appreciable effect on reducing the number of soil microorganisms, including free-living nematodes and did not change the composition of soil microflora. Thus, this study demonstrated that boiled extracts from B. pilosa var. radiata can significantly control nematodes in differing soil types, whereas the effect of the extract on other soil microorganisms is small.
