Screening of soybean aermplasm for resistance to Sclerotinia sclerotiorum

摘要

With the increase of continuous soybean and soybean-corn tillage system (traditionally, soybean-corn-corn or soybean-corn-wheat), Sclerotinia stem rot of soybean, caused by Sclerotinia sclerotiorum. is becoming more and more serious in Heilongjiang Province of China. Soybean acreage used to be under 33% of the total planting acreage annually. It was effective in controlling some soil-borne diseases. But in recent years, soybean is more profitable as a cash crop than other field crops. Some farmersuse more than 50%, even 60%, of their land to grow soybean. Sclerotinia stem rot occurs more frequently. To solve this problem, there are three choices: (1) to control soybean acreage under 33%; (2) to use chemicals; (3) to grow resistant cultivars. Growing resistant cultivars should be the best choice. Currently, there are no cultivars resistant to Sclerotinia sclerotiorum. The objective of this experiment is to screen soybean germplasm for resistance to Sclerotinia sclerotiorum.