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6到8月份,是棉花生长最为关键的时期,也是各种病虫害的多发期。虽然现在各地抗虫棉的种植比率比较高,但是棉花到生长中后期,抗虫性普遍下降,再加上抗虫棉田用药减少,因此棉农朋友们还是不能忽视棉铃虫、棉蚜虫、棉叶螨等病虫害的发生。近一个月以来,除新疆西部和山东外,全国大部棉花产区平均气温比常年同期偏高,而且像河
From June to August, cotton is the most crucial period of growth, but also a variety of pests and diseases of multiple periods. Although the planting rate of insect-resistant cotton is relatively high everywhere now, the resistance to insects generally drops after the cotton is grown to the late stage of growth. In addition, the consumption of the insect-resistant cotton fields is reduced, so the cotton farmers can not ignore the cotton bollworm, cotton aphid and cotton spider mite Pests and diseases such as the occurrence. Nearly a month, in addition to western Xinjiang and Shandong, the average temperature of most cotton-producing areas in the country are higher than the same period of the previous year,