梨大食心虫,是梨树重要虫害之一。梨大以越冬幼虫危害花芽和幼果。被害芽干瘪;被害花丛枯萎;常造成严重减产。梨大越冬幼虫出蛰转芽危害比较集中,若抓住这一关键时刻,喷药防治就能收到显著效果。预测方法如下:2月下旬-3月上旬在梨园内收集50—100个有被梨大危害的枝芽。梨大危害的花芽芽鳞片松散、萎缩,芽茎部有虫孔。3月中旬将收集的有虫枝芽放进广口瓶子里,并插入一支温度汁,做成观测器,桂在梨树背阴面的枝条上,可用以下方法中选其一种进行预测。 1.梨大发生往往与梨树生长发育阶段有着密切的相关性。当春天气温转暖,越冬幼虫就开始活动,梨芽膨大露绿时,是梨大越冬幼虫出蛰害芽盛期可在梨芽开始萌动时,隔天观察一次,当观测器中的越 Pear bore worms, Pear is one of the major pests. Pear overwintering larvae endanger flower buds and young fruit. Victims of shriveled; withered flowers withered; often result in serious cuts. Pear large wintering larva sting bud damage more concentrated, if you seize this critical moment, spray prevention and treatment can receive significant results. The forecast method is as follows: From late February to early March, 50-100 branches and buds harbored by pear were collected in the pear garden. Pear harm bud flower bud scales loose, shrinking, bud stem Ministry of wormhole. In mid-March, collected worms and buds were placed in wide-mouth bottles, and a temperature juice was inserted into the observer. Gui pear branches on the shady branches can be predicted by one of the following methods. 1. Pear often occur with pear growth and development stage has a close correlation. When the spring temperatures warmer, overwintering larvae began to move, when the pear sprouting green dew, the pear overwintering larvae out stinging buds peak in the bud began sprouting, observed the next day, when the observer in the more