Comprehensive use of various methods to control plant pests below the level of economic damage. In China, there are basic strategies for the prevention and control of plant pests. In response to different ecological environments and the occurrence of various plant pests, appropriate measures are taken to create favorable crop growth. Development is not conducive to pest reproduction, spreading conditions. It is possible to eliminate certain pests in crop conditions at specific time and areas. We must constantly coordinate various natural and human factors, strengthen field management, and adopt and promote the prevention and control of plant pests. Make full use of the advantages of various prevention and control measures to continuously reduce the number of pest-colored populations. What measures should be taken in what areas and at what time should be taken depends on the local habitat and social conditions. In the formulation of prevention and control measures, we must analyze the relationship between human factors, natural factors and plant pests, and adopt targeted measures combining prevention and treatment, and take advantage of various measures to overcome the limitations of single measures and put plant pests. Before the damage is done, with the least investment, the best economic benefits are obtained.
Biological control of pests includes beneficial insect control and microbiological pest control. The beneficial animals that are currently used in pest control in production practices include nematodes, insect spiders, and vertebrates.
1 Nematodes Insects Insects Nematodes are a class of microscopic animals that parasitize insects and are linear phylums. It can search for host insects with the movement of water film, invade the insect body from the natural orifice of the insect or the internode membrane, and parasitize the life. Insect nematodes not only directly invade pests, but also can carry and transmit the entomopathogenic bacillus to insects. This bacillus can produce toxins in insects and kill pests. Since insect nematodes can multiply on artificial medium, and nematodes can be stored for a long period of time during infestation, they can be mechanically applied with various kinds of pesticides. Therefore, insect nematodes are commercially produced as a kind of bio-insecticide in the world. The pests that can be used for large-scale control of nematodes that can be industrialized in China at present can be found in peach borer, mulberry, corn borer, ground tiger and earthworm.
2 Insect Insects Insects have approximately 230,000 insects that feed on meat. Most of them are parasitic on insects, and many are important natural enemies of agricultural pests. Most of the predatory and parasitic insects belong to the order Hemoptera, Nematode, Coleoptera, Hymenoptera and Diptera. Three of them are particularly important. The most common predatory insects are crickets, falcons, flower pods, grass worms, troglodytes, ladybugs, wasps, and reins, among which the most important are ladybugs, grasshoppers, and food reins. Parasitic insect species are even more abundant.
In agricultural production, the main ways of using natural enemies to control pests include the following three ways of protecting and using natural enemies. Although there are many types of natural enemies, their actual effects are easily affected by various natural factors and human factors, and they are not very good. Play a role in the suppression of pests. In particular, due to the large number of highly toxic pesticides used, a large number of poisonous insects are killed while pests are killed. Instead, the control objects or other pests that are not serious enough are picked up. This phenomenon has generally occurred at home and abroad. . In order to give full play to natural natural enemies' control of pests, various measures must be used to effectively protect natural enemies and to breed their populations. In our country's agricultural production, there have been many successful examples of the protection and use of natural enemies. The black-egg bee is the main parasite natural enemy of rice stem borers in southern China. The egg parasitoids are used in the mass removal of the three-way pods of eggs. The protector allows the egg parasitoid to emerge safely and return to the field.
Good farming practices are the protection and use of natural enemies. If wheat is about to mature, the number of wheat aphids will decrease. If cotton is at the seedling stage, the aphids become more and more serious and provide food for the natural enemies of the aphids on wheat. A large number of natural enemies moved into the cotton fields to feed cotton aphids. The population of cotton aphid is naturally controlled, so the control of cotton aphid can be controlled without the use of other control measures.
The rational use of pesticides in agricultural production is an important measure to protect natural enemies. By artificially multiplying, a large number of natural enemies can be obtained in a short period of time, released to the field at a suitable time to eliminate pests, and the effect is quick. When the control is at a low population density, other eggs can be found as replacement hosts to protect the number of natural enemies.
3 other animal pests are mainly treated with insects, or with amphibians. There are more than 1000 species of birds in our country, of which about half eat insects. Most of them eat predators. The more important birds include azaleas, woodpeckers and tits. In addition, the pests that they prey on include the locusts, leafhoppers, stink bugs, longhorned beetles, beetles, moth larvae, and Ye Feng. Amphibians are used to control pests mainly frogs, feeding insects include aphids, butterfly moth larvae and adults, weevil, beetles, ants, etc., protect frogs in paddy fields is conducive to the prevention and control of rice pests.
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