We have a couple of Marshal Ashes. The one in the front yard is getting brown rusty colored spots on the leaves. It doesn't look like insects have been eating on it. No holes. Just brown spots. We live in Northwest Arkansas. The temperature has been in the upper 80's. I might have been watering it too much. I was told recently that it needs done only once or twice a week. I'm doing it about every night. Could that be the cause of the spots?
Thanks, Greg
p.s. anyone have a suggestion to get rid of johnson grass? I'm to the point where I am going to have to pull each one up by hand.