Biocontrol is the use of one organism against another.


Biological control can be roughly divided into three categories: insect control, bird control and fungus control. It is a method to reduce the population density of weeds and pests.

It takes advantage of the interrelationship between biological species to suppress one or one species against another or another. Its greatest advantage is that it does not pollute the environment and it is incomparable with non-biological pest control methods such as pesticides. There are many ways of biological control.

Biological control is a method of controlling or eliminating harmful organisms by using beneficial organisms or other organisms.

The contents include:

1) Microbial control. Common antibiotics include fungi, bacteria, viruses and antibiotics capable of secreting antibiotic substances, such as Beauveria bassiana against Dendrolimus punctatus (fungi), various varieties of Bacillus thuringiensis against a variety of forest pests (bacteria), crude extracts of viruses against Alpine moth, Dendrolimus punctatus, Paulownia Hymenoptera (viruses), 5406 against Dendrolimus punctatus punctatus, etc. Microsporidium spp. against seedling blight (actinomycetes) control larvae (protozoa) of gypsy moths, and Taishan No. 1 control Longicorns (nematodes).

(2) Using parasitic natural enemies to control. There are mainly parasitic wasps and flies, the most common are Trichogramma, parasitic flies to control pine caterpillars and other pests, Sclerotium spp. to control longicorn beetles, and Aphis deltoides to control Roundworms.

(3) Use predatory natural enemies to prevent and control. There are many natural enemies, mainly insect-eating, rat-eating vertebrates and predatory arthropods. Birds have different forms of insect prey, such as tits, gray birds and woodpeckers. Rat natural enemies such as weasels, owls, snakes, etc., predatory natural enemies in arthropods are ladybugs, mantids, ants and other insects, spiders and mites.

The method of using natural enemies to control pests is the most widely used. Each pest has one or more natural enemies, which can effectively inhibit the large-scale reproduction of pests. This inhibition is an important part of the feedback mechanism of ecosystem. This ecological phenomenon can be used to establish a new balance between biological populations.

Biological control can be divided into three categories:

(1) Predatory organisms, including grasshoppers, ladybugs, walkers, teratochelate mites, palsy mites, spiders, frogs, toads, mosquito-eating fish, forktails and many insectivorous and beneficial birds.

(2) Parasitic organisms, including parasitic wasps, flies, etc.

(3) Pathogenic microorganisms, including Bacillus thuringiensis and Beauveria bassiana. In China, the use of Ladybug to control citrus scallop, Beauveria bassiana to control soybean carnivorous insects and corn borer, golden wasp to control overwintering red bollworm, and red wasp to control sugarcane borer have all been successful.

Resistant crops

That is, breeding resistant crop varieties to control diseases and pests, such as potato varieties resistant to late blight of potato, sugarcane varieties resistant to mosaic disease, flax varieties resistant to Fusarium wilt and wheat varieties resistant to wheat straw fly, have achieved results. The insect resistance of crops is shown as tolerance, antibiotic resistance and non-hobby. Tolerance is that crops can maintain normal yield despite being invaded by pests; antibiotic is that crops can affect the growth and development or physiological functions of pests, inhibit their viability and development speed, and reduce the reproductive capacity of female adults; non-hobby is that crops do not have attractiveness to pests.

Tillage 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, make them sterile individuals by gamma rays or chemical sterilizers, and then release them to mate with wild pests, so that their offspring lose reproductive capacity. This method was used in Florida to eradicate the sheep spiral skin fly. Genetic control is to change the genetic components of harmful insects so as to reduce the vitality of their offspring, reduce their fecundity or produce genetic infertility. In addition, the use of some biological hormones or other metabolites to make certain harmful insects lose reproductive capacity is also an effective measure of biological control. Biological control of pests and diseases does not pollute the environment and affect human health. It has broad prospects for development.