The natural enemies of fruit tree pests are alternative insect groups that coexist with pests in orchards. They are mainly divided into two categories: predatory and parasitic. The predatory natural enemies mainly include predatory ladybugs, lacewings, small bugs, aphid flies, predatory mites and spiders; parasitic natural enemies include various parasitic bees, parasitic flies and parasitic bacteria. In the application of pesticides in orchards, predatory natural enemies should be fully utilized and protected, pest control should be taken into account with the protection and utilization of natural enemies, and the ecological balance should be maintained. Natural enemy control should pay attention to these issues:

The first is to do a good job in prevention

In the later period of dormancy of fruit trees, when the overwintering pests stolen in large numbers, due to their weakest resistance, it is more important that the natural enemies of the pests have not yet stolen at this time. After fully cutting and scraping the harmful insects, pupa, egg branches and bark, and burning them together, in mid-March, the garden will be sprayed once with a 5 degree stone sulfur mixture; in early April, according to the monitoring results of insects, use The weak resistance of pests during the sting stage, timely application of a targeted agent can play a multiplier effect, especially against aphids and leaf-eating pests.

Second, avoid or use broad-spectrum pesticides during the annual cycle

During the annual cycle, as the tree germinates, expands its leaves, and blooms, the natural enemies of the pests gradually stutter, and their stings are always later than their corresponding pests (following phenomenon of natural enemies). Before June, it was mostly bugs, lacewings, ladybugs and spiders; after July, predatory mites were the main natural enemies. Therefore, in the aspect of pesticide control, especially the use of broad-spectrum insecticides, the use of broad-spectrum pesticides should be avoided before June and after June (after wheat harvest) to avoid the killing of pests and natural enemies. From June to August, aphids, mites, and leaf-eating pests in orchards will be effectively controlled due to the proliferation of natural enemies if the medicine is used reasonably or even without medicine.

The third is selective medicine

In the production, many pesticides have little effect on the growth of natural enemies while controlling pests. Such pesticides are called selective pesticides. Such pesticides should be used more often when controlling pests. Among the insecticides, chlorfenuron, chrysophylline, prochloraz, Bacillus thuringiensis, Bt bacteria, beauveria bassiana, etc., among the acaricides, mite death net, avermectin, nisolan, etc. are all choices. Sex pesticides.

Fourth, there is grass growing in the orchard

The orchard grasses, especially the inter-row grasses, in addition to effectively regulating soil fertility and water supply, are also beneficial to the reproduction and activities of natural enemies of pests due to their early germination and long growth period. Maintain the ecological balance of orchard insects. More importantly, in the prevention and control of pests, natural enemies can hide in the grass to avoid being killed. Grass growing between rows in orchards is generally dominated by legumes, such as alfalfa, white clover, and wheatgrass.

Fifth, intermittent medication

For the prevention and control of pests, no matter how often and the best pesticides are used, the pests will become resistant to life, and the control effect will be reduced. What is more disadvantageous is that long-term application of single or certain pesticides will completely exterminate some natural enemies. From the perspective of comprehensively and effectively maintaining the ecological balance, the orchard medicines should be replaced by different types of medicines.

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