. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. .—Round galls of an Eriophyes. (Author's illustration.). / ^^:^^ a wash of soft soap and sulphur this species can stand upright and even jump into the air and be carried some distance by the wind. In California the Eriophyes vitis Landois (fig. 289) often seriously injures the leaves of the grape. The mites produce an erineum on the under surface of the leaf that causes swellings on the upper surface. The mites pass the winter in the buds or under the bark of the vine. Applications of sulphur will destr
. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. .—Round galls of an Eriophyes. (Author's illustration.). / ^^:^^ a wash of soft soap and sulphur this species can stand upright and even jump into the air and be carried some distance by the wind. In California the Eriophyes vitis Landois (fig. 289) often seriously injures the leaves of the grape. The mites produce an erineum on the under surface of the leaf that causes swellings on the upper surface. The mites pass the winter in the buds or under the bark of the vine. Applications of sulphur will destroy this as well as other species of Eriophyes. Erineimis and galls occur on a great number of our native trees and plants. Some of the more common of these are mentioned below, but many of our forms are yet to be described, and in most cases the mites have not been studied in a careful manner. Recently Hodgkiss has described the numerous species on maples. A small rounded gall on ash leaves is made by Garman. A deformation of the terminal buds of the white ash is caused by E. fraxiniflora Felt. On maples there are several galls. A simple erineum (yellowish to brownish in color) on the under surface of the leaves is tenanted by E. ryderi Banks. A small, irregularly rounded gall, often extremely numerous, is produced by E. quadripedes Shimer, and is at first green, then purplish, and finally black. Elon- gate pouch galls, rarely numerous, are made by E. acericola Garman. In the red erineum on the upper side of the leaves of sugar maple Hodgkiss has found three species of Eriophyes, two species of Phyllocoptes, and one Oxypleurites. In the pink erineum on the under surface of leaves of the red maple he found two species of Eriophyes and one Phyllocoptes. On oaks it can also be noted that erineums are more apt than galls to be tenanted by several species of mites. A wartlike gall on leaves of Negundo, or black maple, is produced by Eriophyes ncgnndi Hodgkiss. In blister
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