Powdery Mildews on Weeds in the Pacific Northwest: A Miscellany of New Records

摘要

Erysiphe polygoni? on? Rumex crispus , documented previously in California, is reported for the first time in the Pacific Northwest.? Podosphaera? ( Sphaerotheca) fusca? is reported in the Pacific Northwest for the first time on? Taraxacum laevigatum , a host record documented previously in Europe. New host records for Idaho are? Golovinomyces sordidus? on? Plantago major ,? Erysiphe convolvuli? on? Convolulus arvensus , and? Podosphaera? (? Sphaerotheca) aphanis? on? Geum macrophyllum .? Golovinomyces (Erysiphe) cichoracearum? on? Cirsium arvense? is reported for the first time in Washington.