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Chive (Allium schoenoprasum L.) is one of the specialty crops grown by farmers in the Puget Sound region of Washington State. In September, 2002, downy mildew symptoms were observed in a 0.2 hectare field planting of chive near Fall City, King County, WA. Downy mildew had not been reported previously on chive in the Pacific Northwest. According to the grower, the planting consisted of two or three different intermixed, unidentified cultivars of chives. Fifty-six percent of 69 sampled plants exhibited symptoms of the disease (Figs. 1 and 2). The most common symptoms were chlorotic tips of affected leaves. As the disease progressed, entire leaves became tan-colored to light brown with regions of brownish to purple sporulation (Fig. 3). Identification of the causal agent, Peronospora destructor (Berk.) Casp. in Berk., was confirmed on the basis of microscopic features that included monopodially branched sporangiophores with acutely tapering termini (Fig. 3), and sporangia (Fig. 4) that were brownish, pyriiform to oblong, and measured 38 to 63 × 16 to 31 μm (1,3). A voucher specimen was deposited in the Mycological Herbarium at Washington State University (WSP number 70309).

First Report of Downy Mildew of Chives Caused by Peronospora destructor in the Pacific Northwest