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在云南蔗区为害甘蔗的螟虫主要有紫螟、二点螟及黄螟,这三种螟虫在甘蔗苗期为害都造成枯心,一般枯心率在1—5%,受害严重的田块,枯心率可达30—40%,使有效茎减少,无效分蘖增加,降低产量。其中前两种主要在苗期危害,造成枯心,大培土以后,就逐步减少。而黄螟自始至终都有发生危害,尤其是甘蔗生长中后期发生量越大,为害越普遍,是当前直接影响大面积甘蔗单产提高,降低质量的一种主要害虫。甘蔗拔节以后,黄螟的危害虽然不造成枯心,但甘蔗基部(根头)被蛀食,组织受破坏,蔗茎生长受到抑制,降低产
Stem borers that harm sugarcane in sugarcane fields in Yunnan Province are mainly Bombyx mori, Borer borer and Sesamia inferens, the three stem borers that cause damage to the cane at the seedling stage, generally at a rate of 1 to 5%, severely damaged fields, Heart rate up to 30-40%, to reduce the effective stems, increased tillering, reduce production. The first two mainly in the seedling damage, resulting in dry heart, earthwork, it gradually reduced. However, the damage of the yellow slug from beginning to end, especially the mid and late stages of sugar cane, the more damage the more, the most direct pest that directly affects the yield and quality of large-scale sugarcane production. After the jointing of sugarcane, although the harm of the yellow-bellied borer does not cause the withered heart, the base of the sugar cane (root head) is eaten, the tissue is destroyed, the growth of the cane stem is inhibited and the yield is reduced