That "bug" is Tetranychus Urticae (arachnidae family), this spider eats the lynph of your plant.. you can buy Phitoseiulus persimilis (antagonist of tetranychus) or try to spray water (it hates water) on infected buds.. Sorry for my bad english but i'm italian..
ah.. so i don't know what kind of bug is it.. I have never seen it here in Italy.. probably it doesn't live in europe ^_^ you can try to catch one spider and put it on the top of your buds.. or patiently pick them off with your hands =)