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1 磷肥杀虫法。棉铃虫在产卵期间最怕磷,一见到磷素就立即逃避。根据棉铃虫的这一特殊习性,可用2％的过磷酸钙浸出液,对棉花进行叶面喷施,每隔5～6厢留一厢不喷,驱使棉铃虫集中产卵,然后集中灭除,效果尤佳。2 氮肥杀虫法。尿素、碳酸氢铵、氨水这三种氮素肥料,具有一定的或较强的挥发性,对害虫具有一定的刺激、腐蚀和熏蒸作用,尤其对红蜘蛛、叶螨、蚜虫、蓟马等一些体型小,耐力弱的害虫,效果尤佳。可用2％的尿素溶液,或1％的碳酸氢铵溶液,或0.5％的氨水溶液,在害虫发生时进行根外喷施。3 硅钙肥杀虫法。硅钙肥是一种新型的化学肥料,实践表明,玉米、
1 phosphorus insecticidal method. Cotton bollworms are most afraid of phosphorus during the spawning period, and once they see the phosphorus they evade. According to this particular behavior of cotton bollworm, available 2% superphosphate leaching solution, the cotton foliar spray, every 5 to 6 boxes leave a box does not spray, to drive the cotton bollworm eggs concentrated, and then focus on the elimination, Especially good results. 2 nitrogen insecticidal method. Urea, ammonium bicarbonate, ammonia three nitrogen fertilizer, with a certain or strong volatility, the pest has some stimulation, corrosion and fumigation, especially for spider mites, spider mites, aphids, thrips and some other Small size, weak endurance pests, the effect is best. Available 2% urea solution, or 1% ammonium bicarbonate solution, or 0.5% ammonia solution, when the occurrence of pests in the root spray. 3 calcium silicate insecticidal method. Calcium-calcium fertilizer is a new type of chemical fertilizer, practice shows that corn,