At present, the spraying of pesticides in the production of fruit trees is the main means of controlling pests. However, in the long-term evolutionary process, pests and widespread natural enemies of pests have gradually formed an ecological balance relationship of interdependence and mutual restraint. If the ecological chain balance between pests and natural enemies is not maintained during the process of controlling pests, the control will not only not receive good results, but will also induce the occurrence of insect pests. First, the classification of fruit tree pest natural enemies The natural enemies of fruit trees pests are an alternative group of insects in the orchard and pests, it is divided into two major categories of predatory and parasitic. Predatory natural enemies mainly include predatory ladybugs, grass ridges, florets, thrips, flies, predators, and spiders; parasitic natural enemies include various parasitoids, parasitic flies, and parasites. In the application of pesticides in orchards, predatory natural enemies should be fully utilized and protected so that the prevention and control of pests and the protection and utilization of natural enemies are both taken into account and attention is paid to the maintenance of ecological balance. Second, the ecological balance of prevention and control technology points 1, do a good job in dormancy prevention and control of dormancy late fruit trees, when a large number of wintering pests out, because of its weakest resistance, more importantly, pests have not yet produced natural enemies at this time, the best time to control, Especially before the fruit tree sprouts. At this time, after fully cutting and scraping pests, worms, eggs, branches and bark, and burning them in a concentrated manner, in mid-March, the whole park sealed and sprayed once with 5 degrees of lime sulfur. In early April, according to pest monitoring. As a result, using insecticides with weak resistance during the out-migration period and spraying targeted agents in a timely manner can have a multiplier effect, especially for aphids and leaf-eating pests. 2. In the annual cycle, hanged or less broad-spectrum insecticides are used. During the annual cycle, with the tree's germination, leaf development, and flowering, the natural enemies of pests will continue to erupt, and their outbreaks will always be later than their corresponding pests ( Natural enemies follow the phenomenon). Before June, there were more florets, grasshoppers, ladybugs, thrips, and spiders; after July, predators were the main natural enemy groups. Therefore, in the prevention and control of pharmaceuticals, in particular the use of broad-spectrum insecticides should be in June before June, after June (after wheat harvest) to avoid using broad-spectrum pesticides to avoid pests, natural enemies kill. From June to August, if the medication is reasonable, even without the use of drugs, the locusts, mites, and leaf-feeding pests in the orchard will be effectively controlled due to the large number of natural enemies. 3. In the selective drug production, many agents have little effect on the natural enemies while controlling pests. Such agents are called selective pesticides. Control pests should use more such agents. Insecticides include diflubenzuron, ameproloprin, buprofezin, Bacillus thuringiensis, Bt bacteria, Beauveria bassiana, etc., acaricide in the acaricide net, avermectin, Nissoline and so on. 4. Orchard grass orchards in the orchard line, especially the interplanted weeds can effectively regulate soil fertility and water supply. Because of its early germination and long growth period, it is conducive to breeding and activities of natural enemies of pests, and the number of natural enemies is significantly deviated. Many, can effectively maintain the ecological balance of orchard pests, and second, more importantly, in the control of pests, natural enemies can avoid being killed in the grass. Orchard grass between the lines, generally legumes, such as alfalfa, white clover, fish and wheat grass. 5, between the potential use of drugs to control pests, even if the best use of pesticides in the frequency and frequency of too many, you can make pests resistant to drugs, the control effect decreased. What is even more unfavourable is that single or several pesticides will completely exterminate certain natural enemies. From the viewpoint of comprehensively and effectively maintaining the ecological balance, orchards should be used to replace different types of agents.
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