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1 过磷酸钙法。过磷酸钙与棉株上分泌的草酸和叶酸发生反应生成叶酸钙和草酸钙,这两种物质是棉铃虫不喜欢的,从而达到避虫的目的,另外,过磷酸钙还能溶解棉铃虫卵壳,风吹后,使其变得更加坚硬,不利于幼虫孵化破壳。 用法:棉铃虫盛发期喷150～200g/kg的过磷酸钙溶液100～150kg/667m~2,每隔7～10天一次,一般喷2～3次即可,这样可使虫卵减少68％～75％,有效地降低棉铃虫的孵化率。
1 superphosphate law. Over-calcium phosphate and cotton plants secreted oxalic acid and folic acid react to produce calcium folate and calcium oxalate, the two substances are not preferred by cotton bollworm, so as to achieve the purpose of avoiding insects, in addition, superphosphate can also dissolve cotton bollworm eggs Shell, the wind, make it harder, is not conducive to larva hatching broken shell. Usage: cotton bollworm spray Sheng 150 ~ 200g / kg of superphosphate solution 100 ~ 150kg / 667m ~ 2, once every 7 to 10 days, the general spray 2 or 3 times, so that the eggs can be reduced by 68 % ~ 75%, effectively reducing the hatching rate of cotton bollworm.