Reproductivity of mixtures of race 3 and race 4 of Heterodera glycines on soybean cultivars
1987
Kim, Y.H. (Korea Ginseng and Tobacco Research Inst., Suwon (Korea R.)) | Riggs, R.D. (Univ., of Arkansas, Fayetteville (USA). Dept. of Plant Pathology)
Soybean cultivars were inoculated with mixtures of races 3 and 4 of the soybean cyst nematode (SCN), Heterodera glycines Ichinohe. On a susceptible soybean cultivar Lee, the relative female maturation of the race mixture was not significantly different when compared with the maturation potentials for each of the two races alone. However, female maturation was significantly lower for the mixture than for race 4 alone on the soybean cultivars Pickett and Mack which are susceptible to only race 4. Selection of SCN populations consisting of race 3 and race 4 resulted in a decrease in race 4 on soybean cultivars Lee and Bragg which are susceptible to all SCN races and an increase in race 4 on soybean cultivars Pickett and Peking which are susceptible to only race 4. A significant reduction of race 4 was also observed on Lee with most mistures of race 3 and race 4 combined in several ratios, suggesting that race 3 was more competitive than race 4 on the susceptible soybean
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