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Violet Gall Midge



P_ violtglmdge

Violet Gall Midge

Usually appear in

Summer to Autumn


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Caused By:-     Midges from the Genus Phytophaga and Dasineura

Description

There are three Violet Gall Midges Dasineura affinis, dasyneura violae and Phytophaga violicola.
Phytophaga violicola is found in the USA where the adult fly or midge lays white eggs in the curled margins of the new unfolded leaves. After hatching the larvae remain in the curled margins where they stimulate curling, distortion, and twisting of leaves. There are several generations per year and the final generation overwinters as a pupa in the rolled leaves.
Dasineura violae is widely distributed in Europe. The yellow/orange larvae causes the dwarfing of cultivated and wild violets, resulting in the formation of a rosette of hairy or furry leaves. The larvae lives at the base of the shortened leaves, and can be found from July to September. They pupate in white cocoons on the plant emerging as adult midges in the following June.
Dasineura affinis is again widely distributed in Europe. The larvae, yellow/orange larvae causes the folding and distortion of the young leaves and flowers. The leaves near the stalks are stimulated, by the feeding and secretion activities of the larvae, to rolled into a compact mass of leaves. The edges of the leaves rolled upwards and often tinged with blue. The larvae pupate in white silken cocoons in the compact mass of rolled leaves. They are usually found at the end of June, and again about the end of August, the last brood spending the winter in the pupal stage.
Heavy infestation will kill plants, but usually the plant survives despite being galled.
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, VINE ERINOSE GALL MITE, WILLOW BEAN GALL SAWFLY.


Control

Cut off the distorted leaves or the whole plant as soon as you see them, and destroy.
Remove plants before they have fully died down for the winter and turn over the soil to expose any pupae.
It is also prudent to occasionally spray the underside of the violet leaves with a systemic insecticide.



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