By Amy Grant Rhubarb is a cool weather perennial vegetable that most people treat as a fruit, using it in sauces and pies. Rhubarb is easy to grow and, for the most part, pest and disease free. That said, rhubarb is prone to spots on its leaves. What causes rhubarb rust spots and what can be done for rhubarb that has brown spots? Let’s learn more. Rhubarb Spots on Leaves There are a couple of diseases common to rhubarb, which may result in spots on rhubarb leaves. Usually leaf spots are more of an aesthetic issue and the unsightly spots don’t affect the edibility of the plant. The two most common diseases seen in rhubarb that result in spotted foliage are Ascochyta rei and Ramularia rei. Ascochyta leaf spot is first seen as small, greenish yellow blotches (less than ½ inch across) on the upper surface of the leaves. Gradually,
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