Can you think of an example of biological pest control

Frogs are natural enemies of mosquitoes.

Snakes are the natural enemies of frogs.

The natural enemy of the cicada is the praying mantis.

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Biological control is a control method that uses beneficial organisms or other organisms to suppress or destroy harmful organisms. The contents include: (1) the use of microbial control.

The common ones are the application of fungi, bacteria, viruses and antibiotic bacteria that can secrete antibiotics, such as the use of Beauveria bassiana to control Masson pine caterpillar (fungus), various variant preparations of Bacillus thuringiensis to control a variety of forestry pests (bacteria), virus crude extract to control cypress moth, pine caterpillar, paulownia big bag moth and other (virus), 5406 to control seedling blight (actinomycetes) microsporidia to control the larvae (protozoa) of Gypsy moth, Taishan No. 1 to control longhorn beetle (nematode).(2) Use parasitic natural enemies for prevention and control. There are mainly parasitic wasps and parasitic flies, the most common are red-eyed wasps, parasitic flies to control pine caterpillars and other pests, swollen-legged bees to control longhorn beetles, and flower horn aphid wasps to control pine round scales.

3) Use predatory natural enemies for control. There are many such natural enemies, mainly insectivore, rodentivorous vertebrates and predatory arthropods. Birds have different insect states that prey on pests, such as, grey sparrows, and woodpeckers.

Natural enemies of rodents such as weasels, owls, snakes, etc., and predatory natural enemies of arthropods include ladybugs, praying mantises, ants and other insects, as well as spiders and mites.

Measures to combat organisms that endanger the health of agriculture, storage, buildings and populations by using ecological phenomena and certain biological characteristics that are interdependent and mutually restrictive among organisms in ecosystems.

Biological control is the use of one organism against another.

The use of natural enemies, the use of crop resistance to pests and diseases, the use of farming methods, the use of sterile insects and genetic methods of control, etc.

Use natural enemies to prevent and control.

The method of using natural enemies to control pests is the most widely used. Each pest has one or several natural predators, which can effectively inhibit the proliferation of pests. This inhibition is an important part of ecosystem feedback mechanisms.

Using this ecological phenomenon, it is possible to establish a balanced relationship between new biological populations. At present, the organisms used for biological control can be divided into three categories: predatory organisms, including lacewings, ladybugs, walking insects, teratosis, blunt mites, spiders, frogs, toads, mosquito-eating fish, forktails, and many insectivorous birds; parasitic organisms, including parasitic wasps, parasitic flies, etc.; Pathogenic microorganisms, including Bacillus thurturingiensis, Beauveria bassiana, etc.

In China, the use of large red ladybug to control citrus blowing scale, the use of Beauveria bassiana to control soybean heartworm and corn borer, the use of golden bee to control overwintering red bollworm, and the use of red wasp to control cane borer have been successful. In the United States, Bacillus thurinaceticus is used to control larch leaf wasps, dance moths, and spruce bud leaf curling moths; In the Soviet Union, the use of nuclear polyhedrovirus and granular virus to control the American white moth was also successful.

Take advantage of crop resistance to pests and diseases.

Achievements have been achieved in the selection of resistant crop varieties to control pests and diseases, such as potato varieties resistant to potato late blight, sugarcane varieties resistant to mosaic disease, flax varieties resistant to Fusarium wilt, and wheat varieties resistant to straw flies. The insect resistance of crops is characterized by tolerance, resistance and lack of preference. Tolerance is the ability of crops to maintain normal yields despite being attacked by pests; Biological resistance is the effect of crops on the growth and development or physiological function of pests, inhibiting their vitality and development rate, and reducing the reproductive ability of female adults; Non-lovability means that crops do not have the ability to attract pests.

Tillage control, sterile insect control and genetic control.

Tillage control is to change the agricultural environment and reduce the occurrence of pests. Sterile insect control is to collect or cultivate a large number of harmful insects, use radiation or chemical sterility agents to make them sterile individuals, and then release them to mate with wild pests, so that their offspring lose their reproductive ability. This method was applied in Florida, USA, to eradicate the sheep's spiral fly.

Genetic control is the process of altering the genetic composition of harmful insects so that their offspring are less viable, less fertile, or genetically sterile. In addition, the use of some biological hormones or other metabolites to make some harmful insects lose their ability to reproduce is also an effective measure for biological control.

Use a bee smaller than a diamondback moth to get rid of diamondback moths.

This is the prevention and control of natural enemies.

The natural enemies of silverfish are very abundant, including nematodes, mites, parasitic wasps, parasitic flies, predatory insects and birds. Maintaining the diversity and stability of forest ecosystems, reducing the use of pesticides and human disturbance to forest ecosystems, and protecting the survival and reproduction of predatory natural enemy insects and birds in forest ecosystems will strengthen the role of natural enemies and effectively reduce the damage of small silverfish. It has been found that more than 7 species of P. huashanensis parasitic wasps (Cocoon wasp and Golden Wasp) have obvious control effects on the occurrence of the insect. Artificially breeding and breeding natural enemies of small silverfish, such as large wax nails, can reduce the damage of red fat beetles; The production of its pathogenic microorganisms and spraying them during the emergence-stage of adults can cause a large number of adults to die of the disease and reduce their damage level.