梨园生草对果树部分害虫天敌的影响

摘要：【研究目的】为研究梨园生草对果树害虫天敌的影响,【方法】采用3种生草方式和托盘法调查方法。【结果】结果表明，种植三叶草、苕子和自然生草，对保护害虫天敌都具有良好的效果，8次调查天敌数量之和，种植三叶草、苕子和自然生草依次为387头、300和149头；土壤清耕，不利于保护害虫天敌。梨园生草也为害虫提供了栖息场所，其中以自然生草的数量最大为3267头，以后依次为种植三叶草、苕子和土壤清耕处理，分别为2622、2026、122头。结果还显示天敌和害虫之间存在相似的消长规律。【结论】与梨园土壤清耕相比，果园生草有利于保护果园生物多样性，对保护害虫天敌作用明显，其中以种植三叶草效果最好。

Effect of Interplanting of Herbage on the natural enemies of fruit tree in Pear Orchard

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.