磷肥驱虫法 在棉田喷施磷肥,可有效地防治棉铃虫的危害。棉铃虫在产卵期间最怕磷,一见到磷元素就立即逃避。根据它的这一特殊习性,可用2％的过磷酸钙浸出液,对棉花进行叶面喷施,每隔5—6垄留1垄不喷,驱使棉铃虫集中产卵,然后集中灭除。 氮肥杀虫法 尿素、磷酸氢铵、氨水这三种氮素 Phosphate insect repellent method spraying phosphorus fertilizer in the cotton field, which can effectively control the harm of bollworm. Cotton bollworms are most afraid of phosphorus during the spawning period, and once they see the phosphorus element, they immediately evade. According to its special habits, available 2% superphosphate leaching solution, the cotton foliar spray, leaving a ridge every 5-6 ridge does not spray, driving the cotton bollworm concentrated spawning, and then focus off. Nitrogen insecticide urea, ammonium hydrogen phosphate, ammonia three nitrogen