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wm discovered in Michigan and was determined to be an isolated infestation. Sprays of DDT and carbaryl were applied throughout the township and by 1962 the insect was deemed eradicated.
For the next 10 years, it appeared that the eradication and quarantine programs were successful since no positive pheromone trap catches have been found within the state.
But, in 1972, positive trap catches were found in three counties and in 1973. 22
75.7%