Abstract:

Abstract: 【Objective】 This article is to study the influence of the grass on the natural enemies of insect pests of the pear trees. 【Methods】Three ways of planting grass were applied and the results were weighed by trays. 【Results】The results showed that it is effective to protect natural enemies of insect pests of the pear trees by planting clover, Common vetch and natural grass and the number of natural enemies is 387,300,149 respectively. Finally the results also show that complete soil tillage is unfavorable to the protection of natural enemies. This is mainly because that the grass in the pear orchard can also provide a shelter to insect pests. Among three ways of planting grass, the number of insect pests is most by planting natural grass, then the planting clover and Common vetch, complete soil tillage is the least. The number is 3267, 2622, 2026, 122 respectively. Though these data we also see that natural enemies and insect pests have similar growth regularity. 【Conclusion】Compared with complete soil tillage, planting the grass is helpful to protect biological diversity, especially natural enemies of insect pests in the pear orchard. Among them, planting clover will have better results.