梨小食心虫,简称“梨小”,俗称“黑膏药”、“串虫子”、“沙虫”等,是梨树主要害虫。我县小观、古村等果园队从一九六○年开始,经过十几年的研究,基本摸清了在当地的发生世代、消长规律,并进行了有效地防 Pear bore insects worms, referred to as “pear small”, commonly known as “black plaster”, “string insects”, “sand worms” and so on, is the pear pests. Since 1960, the orchard team of Xiaoguan Village and Gucun County in our county basically studied the laws of generation and growth and decline in the area after conducting research for more than ten years and conducted effective prevention measures