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Zinnias are colorful, low-maintenance annuals that prefer warm weather and bright sunlight. Although zinnias are relatively disease-resistant, they are sometimes plagued by diseases that cause brown spots. The brown spots are usually caused by one of three types of leaf spot -- Alternaria leaf spot, bacterial leaf spot and Cercospora leaf spot.
Diagnosing Yellow Leaves on Forsythia. A forsythia with yellow leaves may be occurring due to any number of diseases. Below are the more common ones: 1  Yellow veins may indicate tobacco ringspot virus or arabis mosaic virus.2  Each is generally introduced through nematodes. Yellow, black or brown spots that form a larger necrotic tissue can mean that forsythia with yellow leaves are caused by anthracnose, one of the most common fungal diseases on ornamental plants. 2  The yellow tissue may also be colonized by tiny fruiting bodies.