. Bulletin of the Department of Agriculture. Agriculture; Agriculture. THE TEEEAPIN SCALE. 3 by attacking the mistletoe, upon which it thrives very well. It will undoubtedly spread considerably beyond its present range by ad- vancing farther into the territory of its chief host plants. Those regions in which the peach, the plum, the maple, the sycamore, and the mistletoe are abundant probably offer suitable conditions for its growth. ECONOMIC IMPORTANCE. The terrapin scale, in its range and importance, ranks easily as second among the scale pests of the peach, and while not so prolific an
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. THE TEEEAPIN SCALE. 3 by attacking the mistletoe, upon which it thrives very well. It will undoubtedly spread considerably beyond its present range by ad- vancing farther into the territory of its chief host plants. Those regions in which the peach, the plum, the maple, the sycamore, and the mistletoe are abundant probably offer suitable conditions for its growth. ECONOMIC IMPORTANCE. The terrapin scale, in its range and importance, ranks easily as second among the scale pests of the peach, and while not so prolific and not so injurious as the San Jose scale, Aspidiotus yerniciosus. Fig. 1.—Distribution in the United States of the terrapin scale {Eulecanium nigrofasciatum). (Original.) Comstock, it is even more of a nuisance, owing to the difficulty met with in its control. INJURY. This insect causes injury first, by sucking the sap from the trees, and second, by covering the fruit, leaves, and branches with a sweet sticky fluid known as honeydew. The mjury to the trees from the loss of sap taken by the scale is considerable in badly infested orchards, but is small in comparison with the damage resulting from the deposit of honeydew. This deposit, while objectionable, would not cause serious injury were it not for a black or sooty fungus which grows abundantly in the honeydew whenever this is present. On trees which are badly infested with the scale the fruit soon becomes covered with a black sticky coat which makes it almost unsalable, as it is nearly aU classed ^'S culls and is sold Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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