In many cases, natural enemies already exist in the garden but when there are too few of them to control the pests the gardener can increase the biocontrol population by releasing commercially available biocontrols such as insects, mites, nematodes, or even bacteria. IPM is using a number of techniques including plant selection, physical barriers, trapping, biological controls, and when needed, least toxic pesticides. The tactic of biological control has applications extending beyond merely insect control. Plant diseases and weeds have also been managed successfully with the use of biological control agents. Each class of beneficial insects are discussed below, along with one or two examples of that type.
Predators are commonly generalists in their feeding preferences.
Spiders play an important predatory role in many ecosystems. Another very important group of beneficials are the lacewings. The adults of this group are active predators, as are the larvae. Some species of this group have been successfully cultured and are sold for pest control purposes. One of the most common beneficials in everyone's yard and garden is the Ladybug.