Response of Resistant and Susceptible Soybean Cultivars to Continuous Cropping in Area Infested with Cyst Nematode

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Abstract
Soybean management studies were conducted on soil infested with soybean cyst nematode. The field was identified in 1972 as having a high population of soybean cyst nematodes and also severe potash deficiency. The field was used for evaluating soybean breeding material in 1973, 1974 and 1975. In 1976, a management study was initiated to measure the effects of soybean cyst nematodes on soybean productivity. A cultivar resistant to race 3, ''Centennial'', and a susceptible cultivar, ''Tracy'', were grown continuously with and without a nematicide. They were also grown in a sequence of 2 yr of ''Centennial'' and 1 yr of ''Tracy'' and in a blend of 80% ''Centennial'' and 20% ''Tracy''. A breeding line resistant to races 1, 3, and 4 was also included. After 5 yr, no treatment was superior to growing ''Centennial'' continuously. Use of a nematicide reduced numbers of soybean cyst nematodes but did not result in increased seed yields.

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