STUDIES ON THE RESISTANCE OF SOYBAN VARIETIES TO THE SOYBEAN CYST NEMATODE. : II Difference of Physiological Strains of the Nematode From Kariwano and Kikyogahara.

To examine if the resistance of soybean to Heterodera glycines would differ at Kariwano and Kikyogahara, four experiments were conducted at these places under the same design, in which two nematode-populations from Kariwano (A) and Kikyogahara (B) were inoculated to the plant of cliffererit resistant varieties cultured in pot. The cyst formation of the nematode were more with the population B than with A most distinctly in the medium resistant varieties, and the damages of plant were greater with the population B than with A in the weaker resistant varieties. The two populations should belong to different physiological strains of the nematode.