I'm a new grower, but I have a diesel mix and I've learned from
@dire wolf, who also has diesels, that the branches like to tell you when something is wrong, so you are right to follow your instinct. I didn't have any idea at first, but my gut was telling me it meant something was up.
Mine like it a little warmer (72 -74F), or they will throw a fit, along with humidity around 47%. Not sure where you are, but I almost killed everyone I'm growing because it got extremely foggy overnight and when lights went on, humidity was at 97% when I opened the tent. They are finicky with the water. It took me a week to figure that out. Not sure if you answered someone already, but what's your pH? I grow in coco, so I'm sure our ranges will be different.
As reference, I am growing Peyote Critical and Blue Gelato, too. My Super Silver Sour Diesel let's me know at all times when something is off, shows up like that first, then droopy leaves, then two days of making it right.
You have a beautiful plant!
