Black Berries bloomed but no fruit
I have blackberries which have been in place about 4 years. Based on all the blooms this year I was planning on a bumper crop. I have some berries which are producing well but roughly 50 - 60 % of the blooms on some plants never formed fruit, just dried up on the vine. One plant has plenty of fruit, the one next to it has dried up blooms.
Any ideas as to what might cause this. I do have at least two varieties, and I am not sure if only is affected.
I have attached a picture.