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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.
For example, nitrogen deficiency causes leaves to yellow, starting with the oldest foliage. Iron-deficient roses yellow between the veins, while magnesium-deficient plants turn yellow starting at the margins. Magnesium deficiency may also cause small brown spots on the leaves.All these deficiencies can be corrected by measuring soil nutrients and pH, then amending the soil accordingly.or example, black spot produces round dark brown to black spotting and yellowing areas on leaves. Rose rust makes a brownish-red spot on the bottom of the leaf and a yellow patch on the top.