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

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.

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

Plant Health Progress ◽

10.1094/php-2007-1112-01-br ◽

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.

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

Plant Health Progress ◽

10.1094/php-2006-0117-01-br ◽

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.

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First Report of Powdery Mildew of Omphalodes cappadocica Caused by Golovinomyces cynoglossi (Erysiphe cynoglossi) in North America

Plant Health Progress ◽

10.1094/php-2006-1127-03-br ◽

2006 ◽

Vol 7 (1) ◽

pp. 47

Author(s):

Dean A. Glawe ◽

Joseph F. Ammirati

Keyword(s):

North America ◽

Powdery Mildew ◽

Ornamental Plant ◽

Causal Organism ◽

First Report ◽

The Usa ◽

Private Garden

Omphalodes cappadocica DC (Boraginaceae) is grown as an ornamental plant in the USA. Powdery mildew was observed on specimen plants of O. cappadocica growing in a private garden in Seattle, WA in August 2006. This report describes and illustrates powdery mildew of O. cappadocica as well as taxonomically-important features of the causal organism. Accepted for publication 6 October 2006. Published 27 November 2006.

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First Report of Powdery Mildew of Gaillardia × grandiflora (Blanket Flower) Caused by Leveillula taurica in North America

Plant Health Progress ◽

10.1094/php-2006-0112-01-br ◽

2006 ◽

Vol 7 (1) ◽

pp. 60

Author(s):

Dean A. Glawe ◽

Gary G. Grove ◽

Mark Nelson

Keyword(s):

North America ◽

Powdery Mildew ◽

Powdery Mildew Fungus ◽

First Report ◽

Leveillula Taurica ◽

Powdery Mildew Disease

During recent surveys of fieldgrown Gaillardia × grandiflora (Blanket flower) in Yakima Co., WA, a powdery mildew disease was observed on the cv. ‘Baby Cole.’ This report documents the occurrence of the powdery mildew fungus in question (Leveillula taurica (Lév.) G. Arnaud) on Gaillardia × grandiflora and provides information on disease symptomatology as well as features distinguishing this fungus from other powdery mildew pathogens of Gaillardia in North America. Accepted for publication 8 December 2005. Published 12 January 2006.

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First Report of Powdery Mildew of Tecoma capensis Caused by Erysiphe peruviana in North America

Plant Health Progress ◽

10.1094/php-2010-0315-04-br ◽

2010 ◽

Vol 11 (1) ◽

pp. 53

Author(s):

Dean A. Glawe ◽

Tess Barlow ◽

Michael E. Matheron

Keyword(s):

North America ◽

Powdery Mildew ◽

Southern Africa ◽

Present Report ◽

Ornamental Plant ◽

Powdery Mildew Fungus ◽

First Report ◽

The Usa

Tecoma capensis (Thunb.) Lindl. (Bignoniaceae, common name: Cape honeysuckle), native to southern Africa, is grown as an ornamental plant in warm regions of the USA. The powdery mildew reported previously from T. capensis in North America was an undetermined Oidium species in Florida. The present report documents the occurrence of the powdery mildew fungus Erysiphe peruviana (Syd.) U. Braun & S. Takam. on T. capensis in Arizona. Accepted for publication 4 January 2010. Published 15 March 2010.

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First Report of Powdery Mildew of Lycium chinense (Chinese Matrimony Vine) Caused by Arthrocladiella mougeotii in the Pacific Northwest

Plant Health Progress ◽

10.1094/php-2004-1208-01-hn ◽

2004 ◽

Vol 5 (1) ◽

pp. 16

Author(s):

Dean A. Glawe

Keyword(s):

North America ◽

Powdery Mildew ◽

Medicinal Plant ◽

Pacific Northwest ◽

Morphological Features ◽

Lycium Chinense ◽

First Report ◽

Landscape Plant ◽

The Pacific ◽

Plant Grown

Chinese matrimony-vine (Lycium chinense Mill.) is a traditional medicinal plant grown in China and used as a perennial landscape plant in North America. This report documents the presence of powdery mildew on L. chinense in the Pacific Northwest and describes and illustrates morphological features of the causal agent. It appears to be the first report of a powdery mildew caused by Arthrocladiella in the Pacific Northwest. Accepted for publication 10 November 2004. Published 8 December 2004.

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First Report of Powdery Mildew of Platanus occidentalis caused by Microsphaera platani (Erysiphe platani) in Washington State

Plant Health Progress ◽

10.1094/php-2003-0818-01-hn ◽

2003 ◽

Vol 4 (1) ◽

pp. 33 ◽

Cited By ~ 2

Author(s):

Dean A. Glawe

Keyword(s):

North America ◽

Powdery Mildew ◽

Native Species ◽

Washington State ◽

Eastern North America ◽

First Report ◽

Platanus Occidentalis

American sycamore (Platanus occidentalis L.) is a common native species in eastern North America and is planted widely as a landscape tree in other regions. During a survey of powdery mildew diseases in Washington State, the fungus Microsphaera platani Howe was found on American sycamore trees in Madison Park, Seattle. This report documents the presence of M. platani in Washington State and presents information on the fungus. Accepted for publication 30 July 2003. Published 18 August 2003.

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

Plant Health Progress ◽

10.1094/php-2006-0405-01-br ◽

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.

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

Plant Health Progress ◽

10.1094/php-2006-0607-02-br ◽

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.

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

Plant Health Progress ◽

10.1094/php-2003-0206-01-hn ◽

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.

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