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What's the matter with my oak tree?
I've an oak tree, not mature, about 12-14" thick at the base of
the trunk. Quite a lot of the leaves are going brown - the upper surfaces look normal, except for brown patches of course, but the lower surfaces are covered in patches of "stuff". Imagine a miniature umbrella, open, without the handle, with the spike dug into the underneath of the leaf. Now imagine many of these per leaf, some mature looking browny spots, some new-looking green ones, of smaller size. The diameter of the larger spots must be about 1/6" (just over 4mm). These spots, or scales, are held onto the leaf by the central "spike", and can be levered off with the point of my pen-knife. Here's an attempt at ASCII art, may not come out properly unless you're using a fixed-width font (poss. not even then!): ################################ - leaf __|__ _|_ _|_ - things / \ / \ Mature -- immature brown green The umbrella shape is rather exaggerated. What sort of nasty are these??? Any help much appreciated! |
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