Abstract
A large apple orchard at Queenston, Ont., was sprayed regularly with DDT in 1946, 1947, and 1948, but in 1949 part of it was left unsprayed. The unsprayed trees became so heavily infestcd with leafhoppers that by the end of August the foliage was severely injured. The injury was similar to that caused by the white apple leafhopper, Typhlocyba pomaria McAtee.A collection of more than 200 nymphs was made on August 11 and reared to maturity, and additional adults were collected on August 29. All of the males, except a few specimens of Erythroneura lawsoniana Baker, proved to be Typhlocyba froggatti Baker.
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