Traps may also catch animals other than the ones targeted. Check local regulations before trapping. It is harmless to other organisms. Shallow dishes of beer can be used to trap slugs. Biological controls Biological controls are nature's way of regulating populations.
Biological controls rely on predators and parasites to keep organisms under control.
Many of our present pest problems result from the loss of predator species. Seedhead weevils and other beetles weeds Other biological controls include birds and bats that eat insects. A single bat can eat up to 600 mosquitoes an hour. Many bird species eat insect pests on trees and in the garden. This bacteria is harmless to desirable species.