Long term natural pest control is the most cost effective approach to managing insect pests. This method provides stable, continuous suppression of pests by promoting their natural enemies. The long term approach is also the least toxic method of controlling insects. Chemicals, used only as a last resort, are normally not needed.
Why not just spray?
Most chemical insecticides have very poor aim: they cannot target a particular kind of insect, but blast everything in their path, killing not just the pests but their predators as well. The white flies will go, but so will the ladybugs which feed on them. This means, ironically, that these products are effective for only a limited time (see The Pesticide Problem). Because they cut such a broad swath through the insect kingdom, they leave a “hole,” an ecological niche, into which the pests can easily return–unless you spray again, and again. Toxic insecticides, therefore, are a tactic of limited use. (more…)