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在苹果园果树行间种植覆盖作物——白花草木樨Melilotus albus Desr.是果园土壤管理制度中的一项措施。它影响到苹果树上捕食性天敌群落的组成。种植覆盖作物后,一些天敌,如拟长毛钝绥螨Amblyseius pseudolongispinosus Xin et Lian和中华草蛉Chrysopa sinica Tjeder等在苹果树上捕食性天敌群落中的个体数量相对百分比有所增加;而另一些,如小花蝽Orius minutus(Linnaeus)、塔六点蓟马Scolothrips takahashii Priesaer和瓢虫类(Coccinellidae)等天敌有所减少;还有一些天敌,由于发生数量较少,不易与免耕法对照区进行比较。当使用广谱性化学杀虫剂进行树上喷雾时,覆盖作物对于受到化学杀虫剂干扰的苹果树上小花蝽O.minutus(Linnaeus)种群的恢复与建立有着促进作用。
Cultivated crop plants in apple orchard fruit trees - Melilotus albus Desr. Is a measure of orchard soil management. It affects the composition of predators in apple trees. After planting crop, some of the natural enemies, such as Amblyseius pseudolongispinosus Xin et Lian and Chrysopa sinica Tjeder, increased the relative percentage of individuals in the predatory natural enemies of apple trees. In others, Such as Orius minutus (Linnaeus), Scolothrips takahashii Priesaer and Coccinellidae, and some natural enemies were not easily compared with no-tillage control areas due to the small number of occurrences . When the broad-spectrum chemical insecticide was used for tree spray, the cover crop promoted the recovery and establishment of population of O.minutus (Linnaeus) on the apple tree that was interfered by chemical insecticides.