Colomerus vitis Pagenstecher Vine leaf blister mite

Infestations of this widely distributed pest occur on grape vines; the mites sometimes induce the development of large, whitish to yellowish erinea on the underside of the leaves; the upper surface of each gall becomes reddish-brown and blister-like (cf. leaf galls on vines inhabited by the grape phylloxera, Viteus vitifoliae, p. 123). Such damage often causes considerable leaf deformation and is attributable to the erineum strain of the mite. Two other strains are known: a bud strain (= 'grape bud mite') and a leaf-curling strain. Adult mites are 0.160.20mm long, elongate and pale yellowish in colour.

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