My BB have masses of flowers this year , but the bumble bees are making holes in the back of the flowers for nectar and not doing the correct potentiating job... I think its because of the dry spring , is it possible to stop them taking a short cut ? smaller bees seem to be following the correct job description !
Unfortunately it can't be stopped. Keep your fingers crossed!
Same problem with me. I noticed this at the beginning of this week. I also have a mass of flowers in fact the most I have ever seen
Short tongue bees can't reach to feed with broad bean flowers or runner beans etc so they bite a small hole to get to the nectar. Long tongue bees can reach so do the proper pollinate job.