Magazine article American Forests

Ailing Pin Oak

Magazine article American Forests

Ailing Pin Oak

Article excerpt

Q: I am trying to discern what kind of disease my Pin Oak tree has. I live in northern Virginia, and the tree has suffered the problem for the last two years (2008 and 2009). This year being worse then the previous. The leaves develop what looks like very minute webbing or cocooning (I'm thinking it is some kind of fungus) in the connecting veins on the backs of leaves and it seems to slowly eat the leaves away. I never see any larvae on the leaves.

This starts in May and lasts throughout the summer. The leaves drop off before their dead and often curl and die on the tree. This hasn't affected the tree's ability to grow more leaves, but they often become blighted by the same thing.

I was hoping to treat the problem with some kind of herbicide that I could feed the tree in the spring to keep it from developing, or at least help the tree to light this affliction. …

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