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If recommended pesticides for bark beetle prevention are harmful to most insects, won’t their application kill most of the beneficial and non-target insects in the forest?

Last Updated: May 11, 2011

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No. Since the insecticide is generally sprayed on relatively few trees in a forest, only a very low number of non-target insects will be exposed. After the insecticide loses its toxicity, in 1 to 2 years, insects will return to the sprayed trees and will not be affected in the future. Jeff Schalau, Associate Agent, University of Arizona, and Tom DeGomez, Area Agent and Regional Specialist, University of Arizona

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