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Publication Information

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Title: Elongate Hemlock Scale

Author: McClure, Mark;

Date: 2002

Source: 1) USDA, Forest Service, Northeastern Area, Forest Heath Protection, 180 Canfield Street, Morgantown, WV 26505, 2) USDA Forest Service, Northeastern Area, Forest Health Protection, Durham, NH 03824

Publication Series: Program Aid

Description: The elongate hemlock scale, Fiorinia externa Ferris, native to Japan, is a pest of eastern hemlock, Tsuga canadensis, and Carolina hemlock, T. caroliniana, in the Eastern United States. It has been found in the District of Columbia and in nine states from Virginia to southern New England and west to Ohio. F. externa attacks the lower surface of the hemlock needle, where it removes fluids from the mesophyll cells through piercing and sucking mouthparts. Elongate hemlock scale sometimes occurs with two other exotic pests ? a circular hemlock scale, Nuculaspis tsugae (Marlatt), and the hemlock woolly adelgid, Adelges tsugae Annand. Mixed infestations of scales and adelgids can greatly hasten hemlock decline.

Keywords: hemlock, elongate hemlock scale pest alert, elongate hemlock scale, Fiorinia externa, hemlock damage, hemlock needle, NA-PR-01-02, carolina hemlock, eastern hemlock, tsuga canadensis, tsuga caroliniana, T. canadensis, t. caroliniana, eastern forests, hemlock woolly adelgid, circular hemlock scale, nuculaspis tsugae, adelges tsugae annand, hemlock decline, f. externa

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Citation:


McClure, Mark 2002. Elongate Hemlock Scale. 1) USDA, Forest Service, Northeastern Area, Forest Heath Protection, 180 Canfield Street, Morgantown, WV 26505, 2) USDA Forest Service, Northeastern Area, Forest Health Protection, Durham, NH 03824

 


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