, a new species of downy mildew affecting cone flowers () in the United States.

Downy mildew is one of the most important diseases of commercial sunflower and other hosts, including ornamental . has historically been identified as the causal agent of this disease, considered a complex of species affecting nearly 35 genera in various tribes. However, with the use of molecular DNA characters for phylogenetic studies, distinct lineages of in the have been identified, confirmed as distinct or segregated as new species.

First Report of Bacterial Blight of Pennycress Caused by in Wisconsin.

In May 2023, pennycress (, L.) lines undergoing seed production in the Walnut Street Greenhouse at the University of Wisconsin-Madison displayed symptoms of chlorosis and black necrotic leaf spots (Fig. S1-A).

First Report of Sawadaea tulasnei Powdery Mildew of Norway Maple (Acer platanoides) in Wisconsin.

Leaves affected by powdery mildew were collected from a Norway maple tree in early October 2007 in Beaver Dam, WI (Dodge County). Diseased leaves were present throughout the crown of this tree, with white mycelium in irregular and often vein-associated spots and often covering as much as 50% of the upper surfaces of leaves. Examination of the lower surfaces revealed necrosis of the areas underlying mycelium.

First Report of Sudden Death Syndrome of Soybean in Wisconsin.

In August of 2006, soybean (Glycine max (L.) Merr.) plants collected from Columbia, Dane, Green Lake, Walworth, Jefferson, and Waushara counties in southern Wisconsin exhibited symptoms typical of sudden death syndrome (SDS) caused by Fusarium virguliforme O'Donnell & Aoki [synonym F.

First Report of Brown Root Rot of Alfalfa Caused by Phoma sclerotioides in Wisconsin.

Brown root rot (BRR) has been associated with winterkill of alfalfa (Medicago sativa L.) in the temperate regions of North America where winters are severe (1). Although suspected, BRR has not been associated with winterkill of alfalfa in the upper Midwestern United States.