尉犁县是国家优质棉基地,产量逐年再创新高。可是近几年来,棉花在苗期出现不同程度病虫害,严重影响了我县棉花生产继创新高的步伐。棉苗发病轻者25%~40%,重者可达50%以上,造成大量死苗现象,不得不改种或重播,导致棉苗迟播迟发。一、引发棉花苗期病害的原因1.连年重茬连作,肥水管理不当、棉田耕作粗放、土壤中残存细菌和害虫。2.播种劣质种子、低温高湿、棉根发育不良、粗放播种等是引发棉花苗期病害的主要原因。3.土壤中缺乏有机肥,长期大量使用磷肥,造成土壤板结、通透性差。 Yuli County is a national high-quality cotton base, producing a new record high year after year. However, in recent years, the emergence of cotton in different stages of pests and diseases, seriously affected the cotton production in our county following a record high pace. Light cotton seedling incidence of 25% to 40%, severe cases up to 50% or more, resulting in a large number of dead seedlings phenomenon, had to replant or replay, resulting in late delayed onset of cotton seedlings. First, the causes of disease caused by seedling diseases 1. Continuous cropping successive years, improper management of fertilizer, cotton farming extensive, residual bacteria and pests in the soil. Sowing inferior seeds, low temperature and humidity, cotton root dysplasia, extensive planting is the main reason causing disease of cotton seedling. 3. The lack of organic manure in the soil, long-term large-scale use of phosphate fertilizer, resulting in soil compaction, poor permeability.