This looks like it was done, but NO, it was a mold problem, killing the top of the cola. As density goes up watch for this. I live coastal so every night there is a coastal Eddie that brings in alot of humidity and fog. I was feeding through the leaves twice a day and I had to stop the evening feed as the water took 4 times longer to absorb or evaporate, causing some mold. If not dealt with this can ruin bud, but just pull off the bsd and krrp the good. BTW the micro harvest showed me I'm kicking butt as it was silly strong.