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梨大食心虫是严重危害梨树特别是苹果梨的主要害虫。近年来在隆化县发生比较普遍,造成一定程度的减产。“抓住防治时机,选用适宜的药剂,减少用药次数,降低生产成本“是目前化学防治病虫害的方向之一。为了寻找最佳的防治关键时期,1988年春在本县七家乡七家村果园进行了用溴氰菊酯防治梨大食心虫的试验,取得了显著效果。该果园是纯苹果梨园,有梨树300株,15年生,占地70亩。前几年由于防治不力,梨大食心虫发生严重,被害率达90%以上,严重影响产量和品质。1988年我们针对该园虫口密度大,被害芽多的情况,选用了法国罗素优克福公司生产,内江门农药厂分装的2.5%溴氰菊酯(敌杀死)进行防治,该药具有杀虫速度快,杀虫效果好,药效时间长的特点,以触杀作用为主,有一定的胃毒和驱避作用。在防治上采取了转果期严格化防前措施。即在梨果姆指大小时(本地时间
Pear gourd is a serious pest damage, especially apple pear pests. In recent years, more frequent occurrence in Longhua County, resulting in a certain degree of yield reduction. “Seize the opportunity of prevention and treatment, the selection of appropriate agents to reduce the frequency of medication, reduce production costs” is one of the chemical prevention and control of pests and diseases. In order to find the best prevention and control of the critical period, the spring of 1988, seven villages in Qixian Qiaocun carried out with deltamethrin pest control pear trial, and achieved remarkable results. The orchard is pure apple pear, there are 300 pear trees, 15 years old, covering 70 acres. A few years ago due to ineffective prevention and control, Pear borer serious, the victimization rate of 90% or more, seriously affecting the yield and quality. In 1988, we focused on the density of the park insect population, the victim sprouts more than the selection of the French Russell Euclidean company, Neijiang Jiang pesticide plant dispensing 2.5% deltamethrin (enemy kill) for prevention and treatment of the drug has Insecticidal speed, insecticidal effect, efficacy of a long time to contact the role of the main, there is a certain stomach poisoning and repellent effect. In the prevention and control to take the transition period to strictly prevent the precautionary measures. That is, when the size of the pomegranate (local time