Buds browning/Leaf ends curling

I have a couple of plants that have just started budding a week ago, their leaf ends are curling and the hairs on the buds are turning brown/lime greenish. I cannot find any bugs that seem to be causing it. It is an outdoor grow.

has it been really hot? what kind of nutes are you giving

Im having the same problem with some plants too. It only happens to a few cola's not the whole tree

same problem cant find any answers

im also having the same issue, some plants are barely showing bud sites and they seem to be turning brown. At first i thought it was nutes, but Ive been flsuhing for a week, so i doubt its that. And on most plants its the bottom colas, well nugs, because theyre small popcorn nugs that are turning brown. Any help?

Broad mites!! Goodluck you will need it..