Some chemicals stay active for a long time and build up in the environment.
Others kill desirable insects, animals and plants as well as pests. Fertilizers chemical and organic cause excess weed and algae growth when they enter water. This growth not only looks and smells bad, but depletes the water of oxygen and chokes out fish. Attract birds by providing native trees and shrubs for food and cover throughout the year. Spiders, ladybugs, lacewings and mantises all eat pest insects.