Apple maggot flies feed on the fruits of a specific host tree, and mating occurs on and near the fruits of these trees. Originally, apple maggot flies existed only on the fruits of hawthorn trees, which are native to North America. However, approximately 150 years ago, apple maggot flies were observed on cultivated apples, which are related to hawthorns but a different species. Today, many apple trees throughout North America are infested with the flies. These scientific findings reveal what appear

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