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甘兰夜蛾在四川垫江县于70年代曾暴发一次。1990年冬气候偏暖有利越冬,加之1991年春季4—5月间降雨偏少,各种作物生长繁茂,食料丰富,至5月下旬,甘兰夜蛾再度暴发。不仅甘兰、四季豆、莴苣、茄子、海椒、玉米、红苕、豌豆、黄豆等作物受害较重,而且严重危害桑树。其中有200余亩桑苗遭受不同程度的危害,平均单株有虫1.7头,受害株率达60—70%;有10余亩桑苗床幼苗受害,重者幼苗被咬断60%以上;有100余亩投产成年桑树亦受害,重者平均每株有虫46.6%,叶片大部
Hornworm in the Dianjiang County in Sichuan Province in the 1970s had an outbreak. Winter 1990 favorable weather winter wintering, combined with the spring of April 1991 rainfall was less than normal, all kinds of crops, lush growth, food-rich, to late May, the Cyanisseria again outbreak. Not only sweetlan, green beans, lettuce, eggplant, sea pepper, corn, red croaker, peas, soybeans and other crops heavier, but also seriously endanger the mulberry trees. There are more than 200 mu of mulberry seedlings suffering from different degrees of harm, with an average of 1.7 insects per plant, the victim strain rate of 60-70%; more than 10 acres of mulberry seedlings suffer, severe seedlings were biting off more than 60%; More than 100 acres put into operation adult mulberry also suffer, severe cases of an average of 46.6% per plant pests, most of the leaves