First Report of Powdery Mildew on Caragana arborescens in Minnesota and North Dakota Caused by Microsphaera (Erysiphe) palczewskii

2006 ◽  
Vol 7 (1) ◽  
pp. 59
Author(s):  
Dean A. Glawe ◽  
Robert W. Stack ◽  
James A. Walla
Keyword(s):  
North America ◽  
Powdery Mildew ◽  
North Dakota ◽  
Rocky Mountains ◽  
Causal Agent ◽  
First Report ◽  
Powdery Mildew Disease ◽  
Caragana Arborescens ◽  
First Time

In North Dakota and Minnesota, the authors encountered a powdery mildew disease of Caragana arborescens Lam. (Siberian pea tree) previously unreported from these states. The causal agent was determined to be Microsphaera palczewskii Jacz. This report documents for the first time the presence of M. palczewskii in North America east of the Rocky Mountains and includes information on the morphology, classification, and distribution of this species. Accepted for publication 4 January 2006. Published 17 January 2006.

First Report of Powdery Mildew of Ligustrum japonicum (Japanese Privet) Caused by Microsphaera syringae (Erysiphe syringae) in North America

2003 ◽  
Vol 4 (1) ◽  
pp. 27
Author(s):  
Jennifer S. Falacy ◽  
Dean A. Glawe
Keyword(s):  
North America ◽  
Powdery Mildew ◽  
Causal Agent ◽  
King County ◽  
First Report ◽  
Ligustrum Japonicum ◽  
First Time

Powdery mildew was collected from Japanese privet (Ligustrum japonicum Thunb.) in Seattle, King County, WA. The authors determined the causal agent to be Microsphaera syringae (Schw.) Magn. This report documents for the first time the occurrence of M. syringae on L. japonicum in North America, and presents information on the taxonomy and identification of this fungus. Accepted for publication 6 November 2003. Published 10 December 2003.

First Report of Powdery Mildew of Coreopsis Species Caused by Golovinomyces cichoracearum in the Pacific Northwest

2006 ◽  
Vol 7 (1) ◽  
pp. 57
Author(s):  
Dean A. Glawe ◽  
Gary G. Grove ◽  
Mark Nelson
Keyword(s):  
Powdery Mildew ◽  
Pacific Northwest ◽  
Causal Agent ◽  
Diagnostic Features ◽  
First Report ◽  
The Pacific ◽  
Powdery Mildew Disease ◽  
Golovinomyces Cichoracearum

In 2005, the authors encountered a previously unreported powdery mildew disease of Coreopsis verticillata L. (whorled tickseed) ‘Zagreb’ and C. auriculata L. (lobed tickseed) ‘Nana’ in central Washington and determined the causal agent to be Golovinomyces cichoracearum (DC.) VP Gelyuta. This report documents the occurrence of G. cichoracearum on Coreopsis species in the Pacific Northwest, and describes diagnostic features of the disease and causal agent. Accepted for publication 2 March 2006. Published 5 April 2006.

First Report of Powdery Mildew on Dipsacus sylvestris Caused by Sphaerotheca dipsacearum in North America

2006 ◽  
Vol 7 (1) ◽  
pp. 54
Author(s):  
Frank M. Dugan ◽  
Dean A. Glawe
Keyword(s):  
North America ◽  
Powdery Mildew ◽  
Causal Agent ◽  
European Species ◽  
First Report ◽  
Dipsacus Sylvestris ◽  
Noxious Weed

Common teasel (Dipsacus sylvestris) is a European species introduced into North America, and is now widely established and regarded as a noxious weed. In October 2005, a powdery mildew was observed on D. sylvestris in two locations in Pullman, Whitman Co., WA. Examination of diseased material confirmed that the causal agent was S. dipsacearum. This report provides the first documentation of S. dipsacearum on D. sylvestris in North America. Accepted for publication 20 April 2006. Published 7 June 2006.

First Report of Powdery Mildew of Mahonia aquifolium Caused by Microsphaera berberidis (Erysiphe berberidis) in North America

2003 ◽  
Vol 4 (1) ◽  
pp. 41
Author(s):  
Dean A. Glawe
Keyword(s):  
North America ◽  
Powdery Mildew ◽  
Pacific Northwest ◽  
First Report ◽  
Mahonia Aquifolium ◽  
First Time ◽  
Grown Plant

Mahonia aquifolium is a widely-grown plant in the coastal Pacific Northwest. This report documents for the first time a powdery mildew on M. aquifolium in North America caused by a fungus fitting the description of Microsphaera berberidis. Accepted for publication 14 January 2003. Published 6 February 2003.

scholarly journals First Report of Powdery Mildew (Microsphaera palczewskii) on Siberian Pea Tree (Caragana arborescens) in North America

Plant Disease ◽  
2003 ◽  
Vol 87 (4) ◽  
pp. 451-451 ◽  
Author(s):  
C. Nischwitz ◽  
G. Newcombe
Keyword(s):  
North America ◽  
Powdery Mildew ◽  
First Report ◽  
Powdery Mildews ◽  
Leaf Surfaces ◽  
Mean Diameter ◽  
Caragana Arborescens ◽  
The Mean ◽  
Northern United States ◽  
The U.S

Caragana arborescens Lam. is an exotic ornamental that can also be somewhat invasive. In July 2002, powdery mildew was observed on C. arborescens along the Idaho-Washington border in Moscow and Pullman, respectively. Leaves were colonized as soon as they emerged, and entire plants were affected. The fungus covered both leaf surfaces, but cleistothecia were more abundant on abaxial surfaces. The mean diameter of the cleistothecia was 91 (± 9.8) μm. Short-stalked asci averaged 67 (± 7.1) μm × 37 (± 5.2) μm, and the ascospores were 21 (± 2.0) μm × 13 (± 0.8) μm. There are records of four species of Microsphaera on C. arborescens in Europe and Asia. The measurements fit the description of Microsphaera palczewskii Jacz. (1), and the identification was confirmed by comparison with specimens of this fungus on C. arborescens from Sweden (U.S. National Fungus Collections: BPI 749057 and 749058). Specimens of M. grossulariae (Wallr. ex Fr.) Lev. on Ribes divaricatum Dougl. from California (BPI 558266) were also examined, but the cleistothecial appendages were distinctly different from those of the Idaho specimens. To our knowledge, this is the first reported occurrence in North America of powdery mildew on C. arborescens and the first report of M. palczewskii. The latter may have been introduced recently into North America because there are areas in southern Canada and the northern United States in which C. arborescens is unaffected by powdery mildew. Interestingly, it is only in recent decades that M. palczewskii has spread from Asia into Europe (2). Now, host and parasite have been reunited in North America as well. Specimens have been deposited in the U.S. National Fungus Collections (BPI). References: (1) U. Braun. A monograph of the Erysiphales (powdery mildews) J. Cramer, Berlin-Stuttgarg, 1987. (2) S. Huhtinen et al. Karstenia 41:31, 2001.

First Report of Powdery Mildew of Stachys byzantina (Lamb's Ear) Caused by Neoerysiphe galeopsidis in North America

2007 ◽  
Vol 8 (1) ◽  
pp. 36 ◽  
Author(s):  
Dean A. Glawe ◽  
Steven T. Koike
Keyword(s):  
North America ◽  
Powdery Mildew ◽  
Ornamental Plant ◽  
Commercial Building ◽  
First Report ◽  
Powdery Mildew Disease

During the summer of 2007 the authors encountered a previously unrecorded powdery mildew disease on several plants of the perennial ornamental plant Stachys byzantina K. Koch ex Scheele (common names: woolly hedgenettle, woolly betony, and lamb's ear) growing in a plant bed near a commercial building in Salinas (Monterey Co.), California. This report documents the occurrence of Neoerysiphe galeopsidis on this host in North America. Accepted for publication 11 October 2007. Published 17 December 2007.

First Report of Powdery Mildew of Fringed Willowherb (Epilobium ciliatum) Caused by Podosphaera epilobii in North America

2007 ◽  
Vol 8 (1) ◽  
pp. 41
Author(s):  
Steven T. Koike ◽  
Dean A. Glawe
Keyword(s):  
North America ◽  
Powdery Mildew ◽  
First Report ◽  
Powdery Mildew Disease ◽  
Salinas Valley ◽  
Ornamental Crops

Description and first report of powdery mildew caused by Podosphaera epilobii on E. ciliatum in North America are presented in this brief. The weed is commonly found in California's Salinas Valley (Monterey Co.). Confirmation of the powdery mildew disease indicates that this weed will not be a source of the powdery mildew diseases that affect nearby vegetable and ornamental crops. Accepted for publication 4 September 2007. Published 12 November 2007.

First Report of Powdery Mildew of Akebia quinata Caused by Microsphaera akebiae (Erysiphe akebiae) in North America

2004 ◽  
Vol 5 (1) ◽  
pp. 24
Author(s):  
Dean A. Glawe ◽  
Jenny R. Glass
Keyword(s):  
North America ◽  
Powdery Mildew ◽  
First Report ◽  
Western Washington ◽  
First Time

Akebia quinata (chocolate-vine, five-leaf akebia) is grown as a perennial ornamental vine in North America. Five collections were made from A. quinata plants in western Washington with symptoms of powdery mildew caused by Microsphaera akebiae Sawada. This report documents the presence of this fungus in North America for the first time, describes and illustrates this fungus and the disease it causes, and reviews the taxonomy and identification of the fungus. Accepted for publication 24 February 2004. Published 16 March 2004.

First Report of Powdery Mildew of Magnolia Caused by Microsphaera magnifica (Erysiphe magnifica) in the Pacific Northwest

2003 ◽  
Vol 4 (1) ◽  
pp. 37
Author(s):  
Dean A. Glawe
Keyword(s):  
United States ◽  
North America ◽  
Powdery Mildew ◽  
Pacific Northwest ◽  
Western United States ◽  
First Report ◽  
Landscape Plant ◽  
First Finding ◽  
The Pacific ◽  
First Time

Magnolia liliiflora Desrousseaux in Lamarck (orthographic variant: M. liliiflora), a species thought to have originated in China (3), is used as a landscape plant in North America. In August 2002, Microsphaera magnifica U. Braun was collected from three plants of M. liliiflora in the Magnolia collection at the Washington Park Arboretum, University of Washington, Seattle. This report documents for the first time a powdery mildew disease of a Magnolia species in the Pacific Northwest, and the first finding of M. magnifica in the western United States. Accepted for publication 14 April 2003. Published 12 May 2003.

First Report of Powdery Mildew on Caragana arborescens and Caragana grandiflora in Alaska caused by Microsphaera (Erysiphe) palczewskii

2005 ◽  
Vol 6 (1) ◽  
pp. 23
Author(s):  
Dean A. Glawe ◽  
Gary A. Laursen
Keyword(s):  
Powdery Mildew ◽  
Causal Agent ◽  
First Report ◽  
Caragana Arborescens ◽  
Ornamental Species

During August 2004, the authors surveyed sites in and near Fairbanks, AK for powdery mildew diseases and found a powdery mildew previously unreported in Alaska on two specimen plants of the introduced ornamental species Caragana arborescens Lam. (Siberian pea tree) and C. grandiflora DC. The causal agent was determined to be Microsphaera palczewskii Jacz. This report provides the first documentation of M palczewskii in AK and includes information on the morphology and taxonomy of this species. Accepted for publication 27 September 2005. Published 17 October 2005.

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