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编者说明 梨小食心虫是我省梨、桃、山楂等果树的重要害虫。文化大革命以来、栖霞、肥城、菏泽、石门等地的工人、贫下中农和科技人员，结合当地的条件和生产实践，对梨小食心虫做了大量的调查研究工作。所积累的材料包括了我省不同的气候和不同的果树寄主条件下梨小食心虫的发生习性及防治经验。各地还介绍了因陋就简进行调查研究的方法，我们打算分两次印发这些材料。阅读这几个材料，不仅可以帮助我们熟悉梨小的发生规律、掌握梨小的防治策略，而且还为我们提供了进行果树害虫调查研究的方法。 梨小食心虫是我县梨区的主要害虫之一。以前，为害重的年份，虫果率高达９０％。从１９６０年以后．我县观里公社的小观、观里、古村等果园队，对梨小食心虫进行了重点“‘“屯１２专人进行饲养，记载有关生活史。但由于缺乏经验．Ａ工标综曾多份生价一拍他〕１并不注心、十几年来，果园科技组的同志们刻苦学习毛主席劳作．经付“这恐ｏ“””、村头践。再认识”的过程，对梨小食心虫在观里梨区的发生世代、个活习体ｍ技吹’“‘【呕逐步有评认识。在“农业学大寨。的运动电控兀个队的能仓西大卜钻取暗Ｘ汀果品生产迅速增长。小观大队有６３０亩梨园，解放前只产３万斤梨，而多数是虫果；１９？ｚ年同是这一?
Editor’s note Pear Mung Beetle is an important pest of pear, peach, hawthorn and other fruit trees in our province. Since the Cultural Revolution, workers in Qixia, Feicheng, Heze, Shimen and other provinces, poor and middle peasants and scientific and technological personnel have done a lot of investigation and research on Pest insects and worms in light of the local conditions and production practices. The accumulated material includes the habitats and prevention and cure experience of the pear borer under different climates and different fruit tree host conditions in our province. We have also introduced methods of conducting investigations and studies on the basis of simple facts and we intend to issue these materials in duplicate. Reading these materials can not only help us to familiarize ourselves with the law of small pears, master the small pest prevention and control strategies, but also provide us with a method to conduct research on fruit pests. Pear Moxibustion is one of the main pests in Li County. In the past, as a heavy year, insect fruit rate as high as 90%. From 1960 onwards. In the small commune of Guanli Commune in our county, orchard, and other orchard teams, we focused on the breeding of pear pest insects and worms and kept records of their life history. However, due to lack of experience. A worker standard has a number of raw prices beat him] 1 does not mind, more than a decade, orchard science and technology group comrades hard to learn Chairman Mao work. After the “fear of this o” “” Village practice. Re-understanding “of the process of pears, small pest insects in the pear district in the generation of generation, a living body m technology blowing ’”’ vomiting gradually comment on the understanding. In the "Agriculture Science Dazhai. Movement of the electric control Wu Wu team Nengang Nabi Xitin drilling X dark fruit production has grown rapidly. 小观 团队 has 630 acres of pear orchard, before the liberation of only 30,000 pounds of pear production, while the majority is Insects; 19? Z year is the same?