Now then Bud ive got DP Blueberry wk 5 veg in coco. They started to show rust spots on 2 of the 4 plants 3 days ago, but yesterday it seemed alot worse. After a bit of scouting about ive come to the same conclusion as you i think BORON def.
Alright there bro, did you find out what that def was? And have you managed to get it under control if so how, cause ive something thats v similar. thanks in advance