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苹果园种植紫花苜蓿，为捕食性天敌提供了适宜的生存环境和补充猎物，使苹果园天敌数量增加，叶螨种群下降。夏至草是苹果园杂草的优势种，该杂草可提供天敌生存所需的花粉、花蜜和猎物，使东亚小花蝽发生时间早，发育速度快。夏至草与紫花苜蓿混合，可使地面植被上天敌的数量增加２－３倍，苹果树冠天敌数量增加７０％，苹果叶螨种群数量降低３０％。夏至草与紫花苜蓿的比例变化，影响苹果园节肢动物物种数量，当夏至草的覆盖度大于 ２５％时，对地面植被和苹果树冠捕食天敌种群数量最为有利。
Planting alfalfa in apple orchards provides suitable living environment and complementary prey for predatory natural enemies, increases the number of natural enemies in apple orchard, and decreases the population of leaf mites. Summer solstice grass is the dominant species of apple orchard weeds that provide the pollen, nectar and prey needed for the survival of the natural enemies, causing the stink bug to develop early and develop rapidly. Summer solstice mixed with alfalfa, the number of natural enemies on the surface vegetation can increase 2-3 times, the number of apple tree canopy enemies increased by 70%, the number of apple spider mites population by 30%. The change of the proportion of summer solstice and alfalfa affected the number of arthropod species in apple orchard. When the content of summer solstice grass was more than 25%, the population predation on ground vegetation and apple tree canopy was the most favorable.