Determination and Control of Soybean "Fire Dragon Seedling"

Soybean cyst nematode disease, also known as "Huolong Yangzi" disease, is caused by nematodes parasitic on soybean roots. The root system of the diseased plant was underdeveloped, the lateral roots significantly decreased, the growth was slow, the plant was short, the stems and leaves were yellow, the pods were not full, or did not bear fruit, or even the whole plant withered. The observation of pulling up the diseased plant showed that there were many needle sizes and beige dots on the fine roots (the female cyst of the pathogenic nematode). Soybean cyst nematode overwinters in the soil with eggs in the cyst, and the cyst can survive in the soil for many years. Prevention and control methods: (1) agricultural prevention and control. Disease-resistant varieties, such as Kangxian No. 1 and No. 2, were selected for 3-year rotation and increased application of organic fertilizer. (2) Pesticide control. Use 3% carbofuran granules or 5% aldicarb granules, 4ml 5kg every 667 square meters, into the sowing ditch, and then sow seeds.