I found this last night on my only Brandywine tomato plant. Should I be worried? It seems to have spread to other parts of the same plant overnight, but not to any other tomato plants.
did a dog take a leak? if not then you might have a case of grey leaf spot.
OK - so I looks like leaf spot. Whadda think - pull the whole plant and hope it doesn't spread? Or spray a fungacide?
I HATE to lose this one cuz it is a Pink Brandywine. I was soooo looking forward to the tomatoes from it since I had never had this one before.
Any opinions are appreciated.
Spray a fungicide. It can control (but not cure) most tomato diseases except late blight, which you don't seem to have. Daconil is what many growers recommend. If you prefer to take an organic approach, you could use a copper based spray or neem oil. Don't remove the plant unless the disease spreads rapidly. the important thing is to treat all your tomatoes as soon as possible.
and remove all the infected leaves and put in trash can.