Blackcurrant gall mite

The blackcurrant gall mite (Cecidophyopsis ribis) belongs to the Eriophyidae family, order Acariformes. It is a microscopic pest that dwells primarily inside the buds of Ribes species. Due to its size, it is invisible to the naked eye, making it a particularly challenging pest for both commercial growers and home gardeners.

This mite primarily infests blackcurrants, though red and white currants can also be affected. Beyond the direct physical damage caused by feeding, the mite is the primary vector for the Reversion virus, which causes sterile flowers and significantly reduces plant health and productivity.

The life cycle of the mite is synchronized with the growth of the currant bush. Overwintering females inhabit the buds, and reproduction begins early in the spring. During the bud-burst stage, the mites emerge and migrate to newly forming buds, ensuring the continuation of the infestation cycle into the next season.

The most distinctive symptom of an infestation is the presence of 'big buds' — swollen, rounded buds that fail to develop into normal shoots. These infested buds provide a protective environment for the mites to feed and reproduce, leading to stunted plant growth and a severe decline in fruit yield over time.

• Regular inspection of bushes for swollen, distorted buds.
• Manual removal and destruction of infested buds during the dormant season.
• Using resistant cultivars to mitigate the risk of infection.
• Applying systemic or contact acaricides during the migration period.
• Removing and replacing heavily infested plants to prevent further spread.