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Lycium chinense Mill. (Chinese matrimony-vine) (Solanaceae) is a traditional medicinal plant grown in China (4) and used as a perennial landscape plant in North America. During the 2002-2004 growing seasons, two specimen plants of L. chinense in the Medicinal Herb Garden at the University of Washington, Seattle exhibited conspicuous symptoms and signs of powdery mildew. This report documents the presence of powdery mildew on L. chinense in the Pacific Northwest and describes and illustrates morphological features of the causal agent, determined to be Arthrocladiella mougeotii (Lév.) Vassilkov. This appears to be the first report of a powdery mildew caused by Arthrocladiella in the Pacific Northwest. Signs of the disease (Fig. 1) included effuse to dense patches of white to grayish mycelia on leaf surfaces and stems. Infected leaves frequently exhibited chlorotic mottling. The fungus formed superficial hyphae with nipple-shaped appressoria (Fig. 2); conidiophore (Fig. 3) foot cells that were cylindrical and measured (18-) 24-34 (-46) × (5.5-) 8.5-10.5 (-11.5) μm; and conidia (Fig. 4) that were ovoid to short-cylindrical, lacked fibrosin bodies, measured (18.5-) 23-30 (31.5) × (10-) 11-15 (-15.5) μm and formed in chains. (Please note that size ranges follow standard mycological usage [e.g., 2], where the typical range is nested within the observed extreme values which are given in parentheses). The teleomorph was not observed. A voucher specimen was deposited with the Mycological Herbarium of the Department of Plant Pathology at Washington State University.

First Report of Powdery Mildew of Lycium chinense (Chinese Matrimony Vine) Caused by Arthrocladiella mougeotii in the Pacific Northwest