Larvae of two crane fly species recently introduced to the Pacific Northwest from Europe, Tipula paludosa Meigan (introduced in 1965) and Tipula oleracea L. (introduced in 1999) have been found feeding on numerous plants in western OR. Preliminary studies were conducted in 2003 to investigate the distribution and potential impact of these introduced crane flies in western Oregon, with particular emphasis on grass seed and peppermint cropping systems. Both species are widely distributed throughout western Oregon, commonly occurring in grass seed and mint cropping systems, lawns, and golf courses. Damage to lawns and grass seed fields was clearly evident from approximately January through March, while damage in peppermint was clearly evident in early April. In some cases the larvae of both species were found to cause economic damage.
Species 1: Diptera Tipulidae Tipula paludosa (European crane fly)
Species 2: Diptera Tipulidae Tipula oleracea (Marsh crane fly)
Keywords: Economic threshold
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