一、由于受市场经济的影响,大豆的生产面积不断扩大,重迎茬面积明显增加,病原菌大量积累,使近几年大豆褐杆病、菌核病、孢囊线虫、食心虫等都呈上升趋势;同时由于长期施用化肥也造成大豆生产抗逆性弱化及病虫害逐渐加重的趋势。二、重治不重防。农作物病虫害防治是一项全方位系统防治工作,坚持预防为主、治病为辅防治结合的方针,是工 First, due to the influence of the market economy, the soybean production area has been continuously expanded, the area of ​​heavy stubble increased significantly, and the accumulation of pathogens has greatly increased the occurrence of sojae, Sclerotinia sclerotiorum, cyst nematode and mungbean worm in recent years At the same time, due to the long-term application of fertilizers, the resistance to soybean production is weakened and pests and diseases are gradually aggravated. Second, not heavy defense. Prevention and treatment of crop pests and diseases is a comprehensive system of prevention and treatment, adhere to the prevention, treatment supplemented prevention and treatment combined with the principle of