Drastic change in Black Oil Sunflower. Is it dying?
Hi, newbie here. I have a volunteer Black Oil Sunflower that was doing great with lots of blooms for the first time ever. They usually get eaten but this year I tried my version of a scarecrow and it took off. It looked fine but over the last few days it's gotten worse. Now it looks like this. The oldest top bloom has something white & fuzzy on the back of the head in one spot. I have about a dozen more babies going strong but I need to know what I did wrong with this one! I have searched pests and diseases but am not positive; I don't want to use any pesticides if that is not the problem. Any help would be greatly appreciated!
Thanks in advance.
back of the oldest head