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棉苗期有下列四种主要棉虫:棉蚜、棉红蜘蛛、小地老虎和蓟马。在黄河以北棉区内,常年遭受蚜害的棉田达80%以上,无论旱地或灌溉棉田,经常出现严重卷叶,幼苗停滞生长的灾害。棉红蜘蛛发生面积在8—12%之间,干旱年份也极易造成严重灾害。小地老虎和蓟马多集中为害地势比较低湿、杂草多的棉田,造成缺苗断拢现象。以上四种棉虫,常先后混杂发生,必需进行综合防治,才能达到保苗目的。
The cotton seedling has the following four main types of cotton insects: cotton aphids, cotton spider mites, small tiger and thrips. In the cotton area north of the Yellow River, perennial cotton aphids affected by more than 80%, regardless of dry land or irrigated cotton fields, often serious leaf roll, seedling stagnation and growth of the disaster. Mites spider occurred in the area of 8-12%, the year of drought can easily lead to serious disasters. Small land tiger and thrips and more concentrated damage to the topography of the wetlands, weeds and more cotton fields, resulting in lack of seedlings break off phenomenon. More than four kinds of cotton insects, often have mixed occurs, the need for comprehensive prevention and control in order to achieve the purpose of seedlings.