First Report of Podosphaera alpina f. alpina on Tolmiea menziesii in Washington State and British Columbia

2009 ◽  
Vol 10 (1) ◽  
pp. 42
Author(s):  
Lydia S. Putnicki ◽  
Dean A. Glawe
Keyword(s):  
British Columbia ◽  
Powdery Mildew ◽  
Washington State ◽  
Causal Agent ◽  
Understory Species ◽  
First Report

Tolmiea menziesii (Pursh) Torr. & A. Gray (Saxifragaceae, piggyback plant) is an understory species typically sold as an ornamental houseplant. We recently made several collections of T. menzii in Washington and British Columbia with powdery mildew symptoms and determined the causal agent to be Podosphaera alpina f. alpina (U. Braun) U. Braun & S. Takam. This is the first report of this fungus on T. menziesii in Washington and British Columbia. Accepted for publication 5 June 2009. Published 10 August 2009.

First Report of Powdery Mildew of Onion (Allium cepa) Caused by Leveillula taurica in the Pacific Northwest

2004 ◽  
Vol 5 (1) ◽  
pp. 17 ◽  
Author(s):  
Lindsey J. du Toit ◽  
Dean A. Glawe ◽  
Gary Q. Pelter
Keyword(s):  
Powdery Mildew ◽  
Pacific Northwest ◽  
Allium Cepa ◽  
Washington State ◽  
Causal Agent ◽  
Columbia Basin ◽  
First Report ◽  
Leveillula Taurica ◽  
The Pacific ◽  
Published Report

A powdery mildew disease of onion has been observed infrequently in the Columbia Basin of Washington State since 1996, but this is the first published report of this disease in the Pacific Northwest. The causal agent was determined to be Leveillula taurica (Lév.) G. Arnaud. Accepted for publication 29 October 2004. Published 29 November 2004.

scholarly journals First Report of Powdery Mildew of Mahonia aquifolium (Pursh.) Nutt. Caused by Erysiphe (Microsphaera) berberidis (DC.) Lév in Canada

2005 ◽  
Vol 6 (1) ◽  
pp. 29
Author(s):  
Shiguang Zhao ◽  
Simon F. Shamoun
Keyword(s):  
British Columbia ◽  
Powdery Mildew ◽  
Pacific Northwest ◽  
First Record ◽  
Early Summer ◽  
Washington State ◽  
First Report ◽  
The Usa ◽  
Mahonia Aquifolium ◽  
Oregon Grape

Mahonia aquifolium (Tall Oregon Grape) is a plant native to British Columbia and the coastal Pacific Northwest of the USA. The first discovery of powdery mildew of Mahonia aquifolium in the USA was reported in Washington State in 2003. In Canada, powdery mildew of Oregon grape was discovered in the early summer of 2004 in Victoria, BC. To our knowledge, this is the first record of powdery mildew caused by E. berberidis on Oregon grape in Canada. Accepted for publication 15 May 2005. Published 21 June 2005.

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

2003 ◽  
Vol 4 (1) ◽  
pp. 33 ◽  
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.

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 Myosotis sylvatica (Wood Forget-me-not) Caused by Golovinomyces cynoglossi (Erysiphe cynoglossi) in Washington State

2004 ◽  
Vol 5 (1) ◽  
pp. 18
Author(s):  
Dean A. Glawe
Keyword(s):  
Powdery Mildew ◽  
Pacific Northwest ◽  
Washington State ◽  
Causal Organism ◽  
First Report ◽  
The Pacific ◽  
Western Washington ◽  
Symptoms And Signs

Wood forget-me-not cultivars are popular ornamentals in the Pacific Northwest. In western Washington, this species frequently displays symptoms and signs of powdery mildew after anthesis. This report records the disease from King, Pierce, Snohomish, and Skagit counties and describes and illustrates symptoms of the disease as well as taxonomically important features of the causal organism. Accepted for publication 29 October 2004. Published 24 November 2004.

First Report of Powdery Mildew of Chickpea (Cicer arietinum) Caused by Leveillula taurica in Washington State

2008 ◽  
Vol 9 (1) ◽  
pp. 45 ◽  
Author(s):  
K. P. R. N. Attanayake ◽  
D. A. Glawe ◽  
K. E. McPhee ◽  
F. M. Dugan ◽  
W. Chen
Keyword(s):  
Powdery Mildew ◽  
Cicer Arietinum ◽  
First Record ◽  
Washington State ◽  
First Report ◽  
Leveillula Taurica ◽  
High Incidence ◽  
Former Ussr ◽  
Chickpea Cultivars

In Oct. 2007, powdery mildew was found in chickpea fields in an experimental farm near Pullman, Whitman County, Washington. Although disease signs were observed on all chickpea cultivars in the fields, high incidence was seen only on cvs. Dwelley and Spanish White. To our knowledge this is the first record of powdery mildew caused by Leveillula taurica on chickpea in WA. The pathogen has also been reported from chickpea in California and elsewhere, e.g., Ethiopia, India, Iran, Morocco, Pakistan, Sudan, Turkey, and the former USSR. Accepted for publication 4 May 2008. Published 2 July 2008.

scholarly journals Overwintering form of Erysiphe necator, the causal agent of grapevine powdery mildew in southern Syria

2017 ◽  
Vol 57 (2) ◽  
pp. 129-135 ◽  
Author(s):  
Nujoud Alimad ◽  
Walid Naffaa ◽  
Fawaz Azmeh
Keyword(s):  
Powdery Mildew ◽  
Winter Season ◽  
Causal Agent ◽  
Bud Break ◽  
Erysiphe Necator ◽  
First Report ◽  
Primary Inoculum ◽  
Grapevine Powdery Mildew ◽  
Histopathological Studies ◽  
Grapevine Buds

AbstractThe main aims of this study were to determine the overwintering form and the primary inoculum ofErysiphe necator,the causal agent of grapevine powdery mildew in southern Syria. Eleven vineyards located at five different geographical sites were visited every week from March to November in 2014 and 2015. The results of field and histopathological studies showed thatE. necatorsurvived as mycelium in dormant grapevine buds during the winter season. The first flag shoots were observed shortly after bud break in spring. The number of flag shoots varied greatly according to vineyards, cultivars and years, being present on 27.4 to 61.9% of the grapevines in 2014, and on 5.2 to 40% of the grapevines in 2015. The percentage of flag shoots on the same grapevine also varied according to the year, cultivar and location. It was between 4.3 to 9.4% in 2014, and 2.1 to 3.6% in 2015. The disease was observed only on Balady and Black cultivars. Conidia were released from the second week of May to early September. The first conidia were trapped around mid-May, and the first secondary symptoms were observed on leaves from mid-May to early June according to the site. Chasmothecia were observed on leaves in 45.5% of the studied vineyards. The first observation of chasmothecia on leaves was in July, and their numbers varied greatly between vineyards and years. Chasmothecia were not detected on bark, nor were ascospores trapped at the beginning of the season. These results confirmed that the ascospores did not have any role in the initiation of spring infection. To the best of our knowledge, this is the first report of the overwintering form ofE. necatorin Syria.

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 Carrot and Parsley Caused by Erysiphe heraclei in Washington State

2005 ◽  
Vol 6 (1) ◽  
pp. 35 ◽  
Author(s):  
Dean A. Glawe ◽  
Gary Q. Pelter ◽  
Lindsey J. du Toit
Keyword(s):  
Powdery Mildew ◽  
Washington State ◽  
Home Garden ◽  
First Report

From 2002 to 2004, the anamorph of Erysiphe heraclei DC was observed on plants from processing carrot fields in central WA. The teleomorph, not previously reported in Washington, was discovered in a processing carrot field in Grant Co. A fungus matching the description of the anamorph of E. heraclei also was found attacking parsley in a home garden in Grant Co. This report documents the occurrence of E. heraclei and its teleomorph on carrot in WA and the occurrence of E. heraclei on parsley in WA. Accepted for publication 10 January 2005. Published 14 January 2005.

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