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Exotic fruit flies are a threat...
Exotic fruit flies such as Mediterranean fruit fly and oriental fruit fly are among the most serious threats to California’s $43 billion agricultural industry and to the home gardener. These invasive pests are capable of breeding in a very wide variety of fruits and vegetables. Adult female flies pierce the skin of fruits and vegetables and lay eggs inside. The eggs hatch and develop into maggots, which feed on the pulp, rendering the produce unfit for consumption. Since fruit flies are internal feeders, they can be transported long distances by people carrying fruits and vegetables.
Read about government programs to inspect, trap, and control these destructive fruit flies.