Examples of biological control include the destruction of the citrophilus mealybug in California by two parasitic species of chalcid wasps imported from Australia. Biological control can be defined as the use of living organisms to depress the population of a pest. Biological control involves using living organisms, such as insects, pathogens, or grazing animals, to suppress a weed infestation. Biological control or biocontrol is a method of controlling pests such as insects, mites, weeds and plant diseases using other organisms. Natural enemies of insect pests, also known as biological control agents, include predators, parasitoids, pathogens, and competitors.‎History · ‎Types of biological pest · ‎Biological control agents · ‎Pathogens.


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Hawkweed biocontrol consortium

The DDT destroyed lacewings that normally kept mealybug populations biological control definition check. The problem was solved by periodically inoculating orchards with lacewing eggs, as the immature stages of lacewings could tolerate DDT.


Insects that become biological control definition because their natural enemies are killed by insecticides are referred to as insecticide induced pests. Several secondary pests of tree fruits are induced pests. Pest mites are induced by use of pyrethroids, which kill their natural enemies.

Western tentiform leafminer and white apple leafhopper are induced to pest status by broad-spectrum biological control definition. Crop damage by pests such as San Jose scale and woolly apple aphid may be induced partly by overzealous and mistimed insecticide use.

Pear psylla is also an induced pest because broad-spectrum insecticides commonly used to control codling moth kill its natural enemies.

Specialization Specialization, the close association of pest and natural enemy, is a key to success in many cases.

Biological control | Define Biological control at

The woolly apple aphid is controlled in many countries and is the only host of the parasitoid Aphelinus mali. Sometimes there are specialized races of a natural enemy, which differ in their preference for biological control definition particular host or prey.

For example, strains of Trioxys pallidus that were imported for walnut aphid did not control the filbert aphid in Oregon when they were released there.

However, a race of Trioxys pallidus that attacks filbert aphid was biological control definition and introduced, which provided excellent biological control.

Biological control

What makes a good natural enemy? A good biological control agent: Interference Because a number of different natural enemies can attack a pest, it is possible that one might interfere with another, biological control definition in worse control than if just one natural enemy had been present.

Such cases are rare, however, and often two or more natural enemy species work in concert to control a pest. Climatic matching The natural enemy must be suited to the climate in biological control definition new home.

Biological pest control

biological control definition Otherwise, cold winters or hot summers may make it ineffective at controlling the pest. Another aspect of climatic matching is synchrony between the population cycles of predator and prey or parasitoid and host.

For example, synchrony is critical in the interaction between pear psylla and one biological control definition its natural enemies, the parasitic wasp Trechnites psyllae. The disadvantages Control not eradication — A successful agent should not eradicate the weed on which it depends, but reduce it to acceptable levels instead.

There may be costs associated with alternative control methods. Timescale — It takes time. It can take between five to 10 years biological control definition release to achieve successful control. Impacts — The complete impact on the target weed is not always predictable.

Keep in mind that all insect species are also suppressed by naturally occurring organisms and environmental factors, with no human input.

What is biocontrol?

This is frequently referred biological control definition as natural control. This guide emphasizes the biological control of insects but biological control of weeds and plant diseases is also included.

Natural enemies of insect pests, also known as biological control agents, include predators, parasitoids, and pathogens.