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Yes, Trichogramma parasitic wasps are effective biological controls of pesty caterpillars.

Specifically, biological controls tend to take two main forms. One is as predatory micro-organisms, such as the use of Bacillus thuringiensis against infestations of bagworms, caterpillars, hornworms and loopers. The other is as predatory insects, mites and nematodes. Trichogramma wasps are examples of the latter.

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