Biological control methods of aphids

Aphids are the fastest propagating insects, commonly known as greasy insects, honey insects, etc., belonging to Hemiptera, including Aphididae and Aphididae, mainly distributed in temperate regions and subtropics of the Northern Hemisphere. there are about 4700 species in the world and about 1100 species in China. Let's take a look at the biological control methods of aphids.

Harmful characteristics of aphids

Most species of aphids are oligophagous or monophagous, a few are polyphagous, and some of them are important pests of economic plants such as grain, cotton, oil, hemp, tea, sugar, vegetables, tobacco, fruit, medicine and trees. Due to the repeated transfer and taste of host plants during migration and spread, many plant virus diseases can be transmitted and cause more harm, including wheat aphid, wheat aphid, cotton aphid, peach aphid and radish aphid and other important pests.

Biological control of aphids

The biological control of aphids is mainly to protect natural enemies. There are many natural enemies of aphids in nature, including ladybugs, aphid-eating flies, parasitic wasps, aphid-eating gall mosquitoes, crab spiders, lacewings and entomopathogenic fungi. These natural enemies have a strong inhibitory effect on aphids. Therefore, broad-spectrum pesticides can be applied as little as possible, at the same time, the application of pesticides during the peak period of natural enemy activity can be avoided, and aphids can be artificially reared and released under certain conditions.

Expansion: biological control

1. Making use of natural enemies: the method of using natural enemies to control pests is the most common, and natural enemies can effectively restrain the mass reproduction of pests.

2. Resistant crops: resistant crops are to select resistant crop varieties to control diseases and insect pests, such as potato varieties resistant to potato late blight.

3. Sterility control: a large number of harmful insects are cultivated into sterile individuals and released to mate with wild pests, resulting in the loss of reproductive ability of offspring.

4. Genetic control: by changing the genetic composition of harmful insects, the vitality of their offspring is reduced, the fecundity is weakened or genetic sterility occurs.

5. Tillage control: tillage control is to change the agricultural environment and reduce the occurrence of pests.