New records for pathogenic fungi on weedy or non-indigenous plants

摘要

A rust fungus,? Puccinia jaceae , is reported for the first time in the United States on spotted knapweed,? Centaurea stoebe . Powdery mildew ( Blumeria graminis ) of bulbous bluegrass,? Poa bulbosa , is reported for the first time in western North America.? Ramularia nivosa? on? Penstemon palmeri ,? Albugo candida? on? Lunaria annua , and? Pucciniastrum pustulatum? on? Epilobium brachycarpum , are reported for the first time from Idaho. A? Golovinomyces? sp. on? Verbena bonariensis? is reported for the first time from Washington State. The basis for diagnosis for each disease is reported, accompanied by photomicrographs of the fungal pathogens, photographs of some of the diseases, and discussion of the implications of the findings.