RESEARCH ARTICLES/INFORMATION

Research Category: Soybean Disease and Insect Control Year: 2002 Researcher: T. Welacky Institution: AAFC Topic: Cooperative development of SCN resistant varieties and the study of SCN populations and reduction with farm rotations and resistant varieties Funding: $14,000 Research Details: The objective of this research is to develop a resistance to Soybean Cyst Nematode (SCN) and understand the relationship between rotation and SCN populations. In the past year interest in Soybean Cyst Nematode (SCN) resistance in cultivars has increased with more entries being submitted for research. Progress has been made in this cooperative determining that there is not SCN present in 133 fields tested in Ontario and Quebec. The project also developed further understanding of the relationship between resistance and male nematodes and temperature and male and female nematodes. It was found that the male nematodes decreased in number and physiologically active health as resistance increased. It was found that male and female development was highest at 26 to 28 degrees centigrade and more and shorter males (< 800mm) developed on the roots of the resistant cultivar, Bell and following exposure at 35°C. Understanding SCN and the various factors that affect SCN population growth will bring the Ontario soybean industry closer to keeping this disease under control. File: