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The vigour and cropping potential of blackcurrants can be reduced by heavy infestations of big bud mite.
Blackberry and hybrid berry: pruning and trainingBlueberriesCurrant and gooseberry leafspotGooseberries, red and white currantsRaspberryRaspberry leaf and bud miteScientific paper on blackcurrant reversion disease
The mites are microscopic, much less than 1mm in length. They live inside the dormant buds and suck sap from the embryonic leaves. They cause infested buds to become abnormally swollen and rounded.
No pesticides are available to home gardeners for the control of big bud mite.
Common name Blackcurrant big bud miteScientific name Cecidophyopsis ribisPlants affected BlackcurrantMain symptoms Enlarged rounded buds in winter that fail to develop in springMost active January-May
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