No idea, this is the first time I'm trying blueberries myself. It started off well when I transplanted it into a bigger pot, but then the growth stagnated and I thought I might have to replace all its compost with ericaceous (I stupidly put in normal compost at first). I have only got around to replacing maybe 30-40% of the compost. Today I found something looking like larvae crawling on the leaves. I crushed it with a spade quickly, no idea what it is exactly... now I'm worried that the plant is harbouring loads of these and it will die eventually. :(
vg