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利用肥料消灭农作物害虫,花钱少,效果好,不仅能防治环境污染,而且不伤害天敌。肥料与一些化学农药混合使用,既能降低害虫的抗药性又能提高药效。现介绍几种用肥料治虫的办法: 一、用2％的过磷酸钙浸出液,在棉铃虫发生期间,对棉花进行根外追肥,每喷十来行,留出2—3行不喷,驱使棉铃虫集中产卵,聚而歼之。 二、用1％碳酸氢铵溶液喷洒农作物,可以有效地防治红蜘蛛和蚜虫;用0.5％的氨水根外追肥,能扑灭蚜虫和红蜘蛛,而对瓢虫无害。 三、棉田用1％的尿素根外追肥,按0.5％浓度加上
The use of fertilizers to eliminate crop pests, less money, good effect, not only to prevent environmental pollution, but does not hurt natural enemies. Fertilizers mixed with some chemical pesticides, both to reduce pest resistance and improve efficacy. Here are several ways to use fertilizer to pest control: First, with 2% superphosphate leaching solution, during the occurrence of cotton bollworm, the cotton root top dressing, each spray ten lines, leaving 2-3 lines do not spray, driving Helicoverpa armigera concentrated spawning, poly and annihilated. Second, with 1% ammonium bicarbonate solution spraying crops, can effectively control spider mites and aphids; 0.5% ammonia fertilizer, can eliminate aphids and spider mites, and harmless ladybug. Third, cotton with 1% urea top dressing, according to 0.5% concentration plus