Abstract
Larvae of Taxodiomyia cupressiananassa (Osten Sacken) cause galls on the branchlets of bald cypress, Taxodium distichum (L.). T. cupressiananassa is bivoltine in central Illinois. Adults are most common in late May and early August. Mating and oviposition occur soon after adult emergence. In the field, eggs hatch 2 to 4 days after deposition. The number of midge larvae in overwintering galls directly correlate with the length of the gall. A mean of 16 midge larvae was recorded per gall. In central Illinois, Tridymus sp., Aprostocetus fidius (Girault), Tetrastichus sp., and Inostemma sp. are bivoltine internal parasitoids of the midge larvae.
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