Powdery mildew caused by Erysiphe cruciferarum is found for the first time on Chinese cabbage in Korea. H.J. Jee 1, C.K. Shim 1, Y.J. Choi 2. Erysiphe cruciferarum on Sisymbrium officinale. also the fruits are affected. Erysiphe cruciferarum: conidiophore. conidiophore. Erysiphe cruciferarum: conidia. Erysiphe cruciferarum Opiz ex L. Junell, Svensk Botanisk Tidskrift () [MB#].

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PDF version for printing. Accepted for publication 8 November Published 13 December First report of powdery mildew of Eschscholzia californica California poppy caused by Erysiphe cruciferarum in North America.

Plant Health Progress doi: California poppy Eschscholzia californica Cham. Once established, populations become self-seeding and require little care. During an ongoing study of Erysiphales in the Pacific Northwest, a powdery mildew fungus was collected repeatedly on this species in Seattle, King Co.

The fungus was determined to be Erysiphe cruciferarum Opiz ex Junell, a species not reported previously on this host in North America. This report documents the occurrence of the disease and provides information on the morphology and identification of the causal agent.


Erysiphe cruciferarum – Wikipedia

The disease typically was observed during August to October. Severe symptoms or detrimental effects on infected plants were not noted. Mycelia produced appressoria Fig. Conidiophores formed conidia singly Fig. The teleomorph has not been observed.

Signs of cfuciferarum mildew of E. Uninfected leaves left and infected leaves cruciferarhm. Simple left arrow and lobed right arrow appressoria produced by E. The fungus was determined to be E. Features including superficial mycelia, appressoria, conidiophores, and conidia fit features described for E. Furthermore, the rather variable appressoria ranging from lobed to simple fit those of E. The only other two species of Erysiphales Braun 1 listed on Papaveraceae are Erysiphe orontii Castagne [currently designated Golovinomyces orontii Castagne V.

Both occur in the Pacific Northwest 3 but are easily distinguished from the E. Golovinomyces orontii produces chains of conidia, unlike the single conidia produced by E.

Leveillula taurica mycelium is predominantly internal, with conidiophores emerging through stomata, and the first-formed conidium in each series is lanceolate; E. Despite examining material collected during several years the teleomorph was not found. In this respect the life cycle of E.

Where and how this species overwinters remains to be determined. In addition to E. Thus, it appears possible that additional hosts of this powdery mildew fungus will edysiphe found in the northwestern USA.


This locally common disease tends to become noticeable in late summer and early autumn. Furthermore, infected leaves, which appear grayish because of mycelia and conidia, are not dramatic enough to be noticed by most home owners.

It seems likely that the rather mild effects of this disease are responsible for the fact that this fungus was not reported previously. The Powdery Mildews Erysiphales of Europe.

EPPO Global Database

Gustav Fischer Verlag, Jena. First report of powdery mildew of Nandina domestica caused by Microsphaera berberidis Erysiphe berberidis in the Pacific Northwest.

First report of powdery mildew on potato caused by Leveillula taurica in North America. First report of powdery mildew, caused by Erysiphe cruciferarumon Broccoli Raab in California. PDF version for printing Impact Statement.