Caterpillars biological control

Organic growers also use biological control. They are allowed to import natural enemies of pests. This works either through predation or parasitism. This has proven effective for the control of red spider mite and specific caterpillars, and does not affect other insects. And a third technique is to use insect traps ranging from sticky yellow strips to pheromone or sexual lures. The pheromone traps use synthetic extracts of the chemical scents that... 

Songbirds (coal-tit and blue-tit) make a valuable contribution to the biological control of leafroller caterpillars by feeding on these pests. 

Pheromone traps are sometimes used as an aid to warn of possible pest problems. There are also a limited number of permitted treatments including soap sprays a inst aphids and the bacteria treatment, Bacillus thuringiensis for control of caterpillars such as the cabbage white. There are several other permitted, naturally occurring, biological control agents mainly for use in glasshouses. 

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