Natural enemies-Predators, parasites, or pathogens that are considered beneficial because they attack and kill organisms that we normally consider to be pests.
Natural enemies play an important part in controlling aphids. Lady beetles, lacewings, damsel bugs, flower fly maggots, certain parasitic wasps, birds, and fungal diseases all attack aphids.
CONTROLS:
Biological Control: ...
Natural enemies may play an important role in reducing APB larval populations. Birds, especially woodpeckers, feed on larvae throughout the year. A number of species of parasitic wasps, predatory insects, and spiders also feed on APB.
Squash bugs do have natural enemies in the form of insects that feed on them, such as spiders and ground beetles, and diseases that strike them. Tachinid flies and some parasitic wasps prey on squash bugs by laying their eggs in them.
Natural enemies of mites, such as ladybird beetles (ladybugs), thrips and predaceous mites usually keep mite populations reduced.
However, the bagworm has a number of natural enemies "in particular, parasitoid insects, ...
Biological control is the practice of bringing in the natural enemies from the plant's native habitat and introducing them into Australia to help control the weed.
Codling moths are attacked by several natural enemies, although these rarely are effective enough to prevent serious crop damage. Releasing additional natural enemies helps.
As the Michigan State University Extension states, garden pests have natural enemies. The ladybug is a predator that will eat many aphids in a lifetime. Certain small wasps are parasitoids that will lay eggs within a host such as a caterpillar.
Grasshoppers have several natural enemies including birds, rodents, spiders, skunks, several species of flies and horsehair worms. Horsehair worms are long and whitish and live inside a grasshopper.
American scientists are seeking out these natural enemies, including parasitic and predatory insects and pathogenic fungi. Still under study, but showing early promise in tests by the U.S.
Fig Whiteflys have several natural enemies so consideration of them must be taken regarding using synthetic chemical controls. Over time chemical controls become ineffective while natural predators become more numerous.
Garden organically so that your landscape is a welcome home for many natural enemies of slugs, including birds, garter snakes, toads, and lizards.
Maintain permanent walkways of clover, sod, or stone mulches to encourage predatory ground beetles.
Cats are one of the moles' natural enemies. If you pour used cat litter into mole runs and hills you may be able to convince them that they should move to another area.
Insects have natural enemies, known as benefical bugs. Beneficial bugs are either predators or parasitoids. Predator bugs kill and feed on their pray and parasitoids lay their eggs on or in their host.
Biological Control: A Guide to Natural Enemies in North America
New York State Agricultural Experiment Station
Plant Disease Diagnostic Clinic
Cornell Plant Pathology Department ...
Parasitoid wasps, natural enemies of leaf miners, lay their eggs on larvae or near leaf miner egg sites. Pesticides can be effective if applied in mid-May before the much injury has occurred. There are at least two generations per year.
It thrives in partial shade and moist soil but seems to tolerate sunny conditions as well. It's also a prolific seeder. And it has no natural enemies (though we hope that'll change once you've read this article).
 See also: Natural, Plant, Insect, Water, Larva
  
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