灭幼脲对杨干象作用机制和防治的研究

采用灭幼脲油剂，油胶悬剂等，用点涂的方法对杨干象幼虫和成虫进行了适时防治，结果表明：灭幼脲油剂可抑制表皮几丁质的合成达１５％以上；灭幼脲油胶悬剂抑制杨干象成虫精巢和卵巢的发育，可使成虫产卵间降低４０－７０％，使卵的孵化率降为零。这为杨干象的防治找到一条高效，安全，经济，易全文的新途径。

STUDIES ON THE CONTROL OF THE OSTER WEEVIL (CRYPTORRHYNCHUS LAPATHI L.)BY USING BENZOYLPHENOL UREA NO.3

The osier weevil is a wide destroyer of poplar in some parts of the world.This pest is mainly controlled by using conventional pesticides atpresent. These pesticides not only pollute the enviroment, but also cost a lots.From 1987 to 1990, the oil solution and flowable oil colloid ofbenzoylphenol uera No. 3, which are safe, high effective and low cost, weremanufactured, and the spot treatment and hole block methods were used in thecontrolling of the osier weevil in the larval and the adult stages. Themechanisms of the effect of benzoylphenol urea No. 3 on the larva and the adult of this pest is discussed. Experimental results showed that comparing with the larvae of untreated group, more than 15 per cent chitins in theendocuticle of treated larvae was reduced. The spraying of 15%-25% of flowable oil colloid of benzoylphenol urea No. 3 made the ovary and the testis can not develop, and the number of eggs laid by the treated hatching rate of those eggs became zero. The oil solution and flowable oil colloid ofnenzoyphenol urea No. 3 can be effectively used in the control both of the larva and the adult of the oser weevil. The use of these insecticides opens a new way for the control of the osier weevil.