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Cypress Tree Gall Midge

Herbert A. 'Joe' Pase III, Texas Forest Service, Bugwood.org
Taxodiomyia cupressiananassa (Osten Sacken). The cypress twig gall midge  attacks bald cypress (Taxodium distichum) and pond cypress (T. ascendens), inducing galls that develop from leaf bud tissue which negatively affect the appearance of these ornamental trees.

The oval shaped galls are formed on the terminal portion of the branchlets. When mature they resemble miniature pineapples that look like elongate swellings on the leaflets. The color varies from pink at first, turning light green as development progresses. However, the galls appear white most of the time because of a covering of fine, powdery material. When adults emerge the galls turn brown. Overwintering galls are usually copper-brown, dropping with branchlets in late autumn. The galls average 20 mm in length, but larger galls may reach 3 cm in length and 2 cm in width and may contain an average of 16 larvae. The number of midge larvae inside is highly correlated with the length of the gall. The gall tissue is spongy and succulent but becomes less succulent as the midge larvae mature.
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