The apple maggot fly—how an altered sense of smell could drive the formation of new species

“Two months ago, we were congratulating ourselves on a fair crop of winterapples. To all appearance, they were freer from worms than we had known them in this section for years. But, alas! our hopes are again blasted. The apple-maggot seems to be as prolific as ever. Two weeks ago, we overhauled two hundred and fifty bushels of apples that we had gathered and placed in store for winter use; and of that number we threw out fifty bushels, most of which had been rendered worthless; and still the work of destruction goes on. The depredations of the apple-maggot continue, converting the pulp of the apple into a mere honeycomb, and rendering another overhauling soon indispensable.”