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通过系统调查、大田普查、黑光灯诱测等方法发现近5年棉田病虫发生了巨大的变化:鳞翅目害虫为害减轻,吸汁类害虫上升为主要害虫,病害造成的损失大于虫害,缺钾性生理性病害连年流行。并从Bt抗虫棉的大面积种植、棉田化防次数减少、土质的恶化、植保技术的滞后等方面浅析了原因。
Through systematic investigation, field survey and black light detection, it has been found that pests in the cotton field have undergone tremendous changes in recent 5 years: the lepidopteran pests have reduced the damage and the astringent pests rise as the main pests. The damage caused by the diseases is greater than that of pests and potassium deficiency Sexual physiological diseases perennial epidemic. The reasons were analyzed from the aspects of large-scale planting of Bt cotton, reducing the number of chemical defense in cotton field, deteriorating soil quality and lagging of plant protection techniques.