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Vine Erinose Gall Mite



P_vineermite

Vine Erinose Gall Mite

Usually appear in

Spring to Autumn.


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Caused By:-     The Gall Mite Colomerus vitis

Description

The Vine Erinose Mite Colomerus vitis of the family Eriophidae, is also known also as the grape erineum mite, grape gall mite, grape bud mite, grape blister mite, grape leaf blister mite, leaf roll mites, bud mites and blister mites.
It is very small and invisible to the naked eye, being 0.15 mm long, white and spindle shaped.
There are three strains which share the same morphology and are classed according to their different behaviour which cause different damage to the vine.
One causes the leaves to roll, forming miniature tunnels another called the bud mites over-winter inside the buds and under their scales. In spring they enter new shoot buds to feed and reproduce and the last known as the blister mites move from the bud scales to feed under the leaves causing them to develop a blister (gall) on the upper surface of the leaf and on the underside of these areas there is a dense mat of fine, whitish hairs, which eventually darken to brown at the end of the season.
There are several generations per year starting in the spring; at the end of the season they move to the bud scales or overwintering places at the base of the shoots.
The blister is stimulated to grow by secretions from the mite, which lives inside the gall. The damage done is usually very minor and can usually be ignored.
Picture by Jody Fetzer, New York Botanical Garden, Bugwood.org.
See also these other Galls ACER GALL MITES, ACORN GALL MITES, AZELAE GALL, BEECH GALL MIDGE, BLACKCURRANT GALL MIDGE, BROOM GALL MIDGE, CAMELLIA GALL, CROWN GALL, EUONOMUS GALL, FELT GALL MITES, FORSYTHIA GALL, GALLS, GALL WASP, GLEDITSIA POD GALL MIDGE, HEMEROCALLIS GALL MIDGE, HAWTHORN BUTTON TOP GALL MIDGE, KNOPPER GALL OF ACORNS, LEAFY GALL, LIME NAIL GALL MITE, OAK GALL WASP, PEAR LEAF BLISTER MITE, PINAPPLE GALL ALDELGID, PLUM GALL MIDGE, ROBINS PINCUSHION, TURNIP GALL WEEVIL, VIOLET GALL MIDGE, WILLOW BEAN GALL SAWFLY.


Control

Individual leaves can be picked off and burnt or destroyed to prevent the spread of this pest, but they can be easily controlled by the use of an application of sulphur which is also used to control downy mildew.
Spraying with other approved systemic insecticides will also work.



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