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Robins Pincushion



P_robpincshn

Robins Pincushion

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Caused By:-     The Wasp Diplolepis rosae

Description

Robin's pincushion gall, Moss gall or Rose bedeguar gall develops on the common dog rose(Rosa canina) in late summer and autumn. This gall like most other galls are induced by insects feeding on the plant. In this case it is a wasp Diplolepis rosae and a couple of other wasps.
In late Spring eggs are laid in the leaf buds of the rose and on hatching the larvae starts to feed on the rose leaf or stem. The secretions of the larvae induces the rose to start to produce the green/red sticky hairy growth at the center of which is the gall inside of which the larvae lives and feeds on the gall as it grows. The structure of the gall looks like a ball of moss and can be up to 10cm in width. In the Autumn the larvae turns into a pupa and overwinters until it pupates in the following spring to repeat the cycle.
The galls occur mostly on plants that are under stress, i.e. very dry conditions, waterlogging or hedge cutting, whereas vigorously growing plants tend not to have galls.
Picture by Björn Appel 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, 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, TURNIP GALL WEEVIL, VINE ERINOSE GALL MITE, VIOLET GALL MIDGE, WILLOW BEAN GALL SAWFLY.


Control

Controlling gall insects is best done before or just after the wasp pupates, as any treatment applied after galls have been initiated, by the pests, will not prevent the galls from growing even if the parasite is eradicated, but the following year the disease may be much reduced.
Pruning out heavily galled parts of the rose will help reduce populations of the pests.
While fairly large, and present in quite large numbers on scrub specimens, they little harm apart from aesthetics.
An insecticidal oil wash may help prevent the larvae or eggs from surviving.
Birds are probably predators of the wasps.

P_robpincshn P_robpincshn[2]

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