Problems with blueberry bush nor fruiting

Hi there. I have three blueberry bushes next to each other. I planted two originally and they produced lots of fruit.
I then added a third after the other two had matured a bit (2 years later)and over the last two years two of the plants (the new one and the one old one) are producing little fruit, which do not grow beyond small blue buds
There is something on the stems of all three which look like 1 cm circles which are slightly enlarged over the surface
Any ideas?
Thank you in anticipation
I then added a third after the other two had matured a bit (2 years later)and over the last two years two of the plants (the new one and the one old one) are producing little fruit, which do not grow beyond small blue buds
There is something on the stems of all three which look like 1 cm circles which are slightly enlarged over the surface
Any ideas?
Thank you in anticipation
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Any help greatly appreciated
Thank you
I noticed scale insects on mine a couple of months ago.
I spent about an hour scraping them off with a fingernail and I can't see any now.
It wasn't a very pleasant hour, but my bushes are healthy and loaded with fruit this year
Wisdom is not putting it in a fruit salad.