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Hawthorn Button Top Gall Midge



P_hawthornbtgmidge

Hawthorn Button Top Gall Midge

Usually appear in

Summer


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Caused By:-     The Gall Midge Dasineura crataegi

Description

Hawthorn Button Top Gall Midge is a common gall midge which lays its eggs in the shoots of Hawthorn in June. The developing larva produces a hormone which causes the developing shoots to develop into a rosette of small leaves instead of the normal elongated growth. These rosettes are providing shelter for the larvae. Several Orange/white legless larvae, about 2mm long, live within the rosette. These rosettes later dries up and dies after the midges have left, which makes the Hawthorn look rather unsightly. This pest seems to attack Hawthorn which are regularly trimmed as hedges in preference to a normal Hawthorn tree. Picture from Wikimedia Commons.
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, 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, VINE ERINOSE GALL MITE, VIOLET GALL MIDGE, WILLOW BEAN GALL SAWFLY.


Control

Spraying with an insecticide at the larval stage in order to prevent the spread of this pest, but once the gall has formed there is little that can be done.
The galls may be attracted to the smell of damaged Hawthorne, therefore after trimming the Hawthorne if a strong smelling spray is used it may help to deter the midges.



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