This disease attacks mainly blackcurrant bushes.
Tiny mites inside the buds cause the buds to become round and swollen (the
healthy buds are pointed and narrow). The swelling becomes noticeable in January to February
time as the buds begin to form. In Spring, affected buds fail to
develop and their leaves are distorted.
mite is also the prime cause of reversion disease in blackcurrants.
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