rhubarb leaf disease?
Hi, I have some rhubarb plants that have been in the ground about 3 or more years. They have never produced very much. This year the leaves are very discolored, brown, yellow and some red. When they get brown they dry up and fall off. They started out looking good. Any idea of what could be the problem? One other thing is that there are black walnut trees on three sides of our field but don't think they are close enough to cause a problem. I know that lots of things don't like the juglone from black walnuts. Thanks.