Answer: Several fungi (Alternaria, Phyllosticta, and Colletotrichum) commonly attack Aucuba throughout the growing season, causing large irregular spots along the margins of the leaf. In most instances, leaf spot diseases of aucuba are associated with plants weakened by poor fertility, drainage problems, or from root decay. Prune out as much of the diseased plant parts as possible and spray with a broad spectrum fungicide such as maneb, chlorothalonil, or captan. These fungicides are available under a variety of trade names. Be sure to follow label directions.
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