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Pear Leaf Blister Mite



P_pearlfblstmte

Pear Leaf Blister Mite

Usually appear in

Spring to Autumn.


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Caused By:-     The Mite Phytoptus pyri(Eriophyes Pyri)

Description

Fallen leaves of vine maple (Acer circinatum) showing damage by Pear leaf Blister Mites.
The Pear-Leaf Blister Mite(Phytoptus pyri previously Eriophyes Pyri) is the same mite that causes Blister Mite in other plantslike Apple, Pear, Quince, Hawthorn and Cotoneaster and other related species. The bodies of these mites are elongate and wormlike. The body length is 1/100 inch (200-240 microns; 0.2 mm). Therefore these will only be seen with a compound microscope. While in the bud, mites are white; later in the season they assume a pinkish colour. The mite is the cause of the numerous pale blister-like galls on the leaves of these trees. Each leaf galls are each caused by a single minute mite which enters the leaf by the stomata or breathing pores. Where they breed in the leaf tissues. The galls turn black later, and the whole leaf may die or more usually falls off. Young fruitlets are also attacked and ruined by small reddish blister-like galls being formed on them. Once inside the females begin to lay eggs which will repeat the cycle 3 to 3 times a year. Activity ceases during June, July and August, resuming when cool evenings return. Mites enter bud scales from September to November. where they over-winter . As soon as the buds breaks in the Spring they attack the leaves or blossoms and enter the tissue. Picture by H.J. Larsen, 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, PINAPPLE GALL ALDELGID, PLUM GALL MIDGE, ROBINS PINCUSHION, TURNIP GALL WEEVIL, VINE ERINOSE GALL MITE, VIOLET GALL MIDGE, WILLOW BEAN GALL SAWFLY.


Control

Spraying with a systemic insecticide or oils will help, but the main way to eradicate this pest is doing a winter wash with insecticidal oils in the dormant period. Usually the infestation is not excessive and can be tolerated as the vigour of the tree is not affected.



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