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近年来,蛴螬危害怀山药较重。据调查了解,重点地块的虫口密度为每平方米在32头以上,最多处1米平方内竟挖出63头蛴螬。使怀山药的产量和质量程度不同地受到影响。 1986年以来,经四年选用辛硫磷、敌敌畏、呋喃丹三种农药防治蛴螬。其中分层定量施用呋喃丹的方法,连续四年来均获得了较显著的防治效果。具体防治方法职下: 一、结合挖刨怀山药时进行第一次底层施药。亩施药量为2.5-3.5公斤,药剂均匀地撒在58-68厘米的深层土壤中,形成根下的毒土层。二、翌年春耕地时,第二次施入呋喃丹。亩施药量为3.0-3.5公斤,施药的深度在37厘米左右的土壤中,把药均匀地撒入土壤里,形成根区的毒土层。关键环节是第二次施药。
In recent years, Xuyi harm heavier yam. According to the survey, the density of pest population in key land plots is more than 32 per square meter, with a maximum of 63 monstrosities excavated within 1 square meter at most. So that the yam yam production and quality levels are affected differently. Since 1986, after four years of use phoxim, dichlorvos, carbofuran three pesticides control cholelanthine. Among them, the method of quantitatively administering carbofuran by stratification has obtained more significant prevention and control effects for four consecutive years. Specific methods of prevention and control job: First, combined with digging shaving yam when the first time the bottom of pesticides. The amount of pesticide applied is 2.5-3.5 kg per mu. The medicament is evenly sprinkled on the deep soil of 58-68 cm to form a toxic soil layer under the root. Second, the spring of next year, the second application of carbofuran. The amount of pesticide application is 3.0-3.5 kilograms, the depth of application of 37 cm in the soil, the medicine evenly into the soil, the formation of the root zone of toxic soil layer. The key is the second application.