scholarly journals New Gerbera Daisy Varieties for Large Containers and Flower Gardens

EDIS ◽  
2013 ◽  
Vol 2013 (9) ◽  
Author(s):  
Zhanao Deng
Keyword(s):  
United States ◽  
Powdery Mildew ◽  
The United States ◽  
Fact Sheet ◽  
Yellow Orange

Gerbera daisy is one of the most popular flowers in the United States. Recently, interest has increased in growing gerberas in large containers for indoor or outdoor use. ‘Funtastic™ Tangerine Eye’ and ‘Funtastic™ Golden Eye’ have been selected and tested specifically for use in large containers. These cultivars produce large, powdery mildew-resistant plants and large, attractive flowers in orange-red or yellow-orange that complement the existing Funtastic™ series of gerbera cultivars. This 8-page fact sheet was written by Zhanao Deng, and published by the UF Department of Environmental Horticulture, September 2013. http://edis.ifas.ufl.edu/ep482

scholarly journals First Report of Powdery Mildew Caused by Erysiphe aquilegiae var. aquilegiae on Aquilegia flabellata in Italy

Plant Disease ◽  
2004 ◽  
Vol 88 (6) ◽  
pp. 681-681
Author(s):  
A. Garibaldi ◽  
D. Bertetti ◽  
M. L. Gullino
Keyword(s):  
United States ◽  
Powdery Mildew ◽  
The United States ◽  
Northern Italy ◽  
American Phytopathological Society ◽  
First Report ◽  
Powdery Mildews ◽  
The Family ◽  
White Mycelium ◽  
The University

Aquilegia flabellata Sieb. and Zucc. (columbine) is a perennial garden species belonging to the family Ranunculaceae. During the summer of 2003, a severe outbreak of a previously unknown powdery mildew was observed in several gardens near Biella (northern Italy). Upper surfaces of leaves were covered with a white mycelium and conidia, and as the disease progressed infected leaves turned yellow and died. Foot cell was cylindric and appressorium lobed. Conidia were hyaline, ellipsoid, and measured 31.2 to 47.5 × 14.4 to 33 μm (average 38.6 × 21.6 μm). Fibrosin bodies were not present. Cleistothecia were globose, brown, had simple appendages, ranged from 82 to 127 (average 105) μm in diameter, and contained one to two asci. Ascocarp appendages measured five to eight times the ascocarp diameter. Asci were cylindrical (ovoidal) and measured 45.3 to 58.2 × 30.4 to 40.2 μm. Ascospores (three to four per ascus) were ellipsoid or cylindrical and measured 28.3 to 31.0 × 14.0 to 15.0 μ;m. On the basis of its morphology, the pathogen was identified as Erysiphe aquilegiae var. aquilegiae (1). Pathogenicity was confirmed by gently pressing diseased leaves onto leaves of five, healthy A. flabellata plants. Five noninoculated plants served as controls. Inoculated and noninoculated plants were maintained in a garden where temperatures ranged between 20 and 30°C. After 10 days, typical powdery mildew symptoms developed on inoculated plants. Noninoculated plants did not show symptoms. To our knowledge, this is the first report of the presence of powdery mildew on Aquilegia flabellata in Italy. E. communis (Wallr.) Link and E. polygoni DC. were reported on several species of Aquilegia in the United States (2), while E. aquilegiae var. aquilegiae was previously observed on A. flabellata in Japan and the former Union of Soviet Socialist Republics (3). Specimens of this disease are available at the DIVAPRA Collection at the University of Torino. References: (1) U. Braun. Nova Hedwigia, 89:700, 1987. (2) D. F. Farr et al. Fungi on Plants and Plant Products in the United States. The American Phytopathological Society, St Paul, MN, 1989. (3) K. Hirata. Host Range and Geographical Distribution of the Powdery Mildews. Faculty of Agriculture, Niigata University, 1966.

scholarly journals Distribution and Characterization of Podosphaera macularis Virulent on Hop Cultivars Possessing R6-Based Resistance to Powdery Mildew

Plant Disease ◽  
2016 ◽  
Vol 100 (6) ◽  
pp. 1212-1221 ◽  
Author(s):  
Sierra N. Wolfenbarger ◽  
Stephen T. Massie ◽  
Cynthia Ocamb ◽  
Emily B. Eck ◽  
Gary G. Grove ◽  
...  
Keyword(s):  
United States ◽  
Powdery Mildew ◽  
Mating Type ◽  
Resistance Genes ◽  
Severe Disease ◽  
The United States ◽  
Fitness Cost ◽  
Eastern United States ◽  
Host Genotype ◽  
Podosphaera Macularis

Host resistance, both quantitative and qualitative, is the preferred long-term approach for disease management in many pathosystems, including powdery mildew of hop (Podosphaera macularis). In 2012, an epidemic of powdery mildew occurred in Washington and Idaho on previously resistant cultivars whose resistance was putatively based on the gene designated R6. In 2013, isolates capable of causing severe disease on cultivars with R6-based resistance were confirmed in Oregon and became widespread during 2014. Surveys of commercial hop yards during 2012 to 2014 documented that powdery mildew is now widespread on cultivars possessing R6 resistance in Washington and Oregon, and the incidence of disease is progressively increasing. Pathogenic fitness, race, and mating type of R6-virulent isolates were compared with isolates of P. macularis lacking R6 virulence. All isolates were positive for the mating type idiomorph MAT1-1 and were able to overcome resistance genes Rb, R3, and R5 but not R1 or R2. In addition, R6-virulent isolates were shown to infect differential cultivars reported to possess the R6 gene and also the R4 gene, although R4 has not yet been broadly deployed in the United States. R6-virulent isolates were not detected from the eastern United States during 2012 to 2015. In growth chamber studies, R6-virulent isolates of P. macularis had a significantly longer latent period and produced fewer lesions on plants with R6 as compared with plants lacking R6, indicating a fitness cost to the fungus. R6-virulent isolates also produced fewer conidia when compared with isolates lacking R6 virulence, independent of whether the isolates were grown on a plant with or without R6. Thus, it is possible that the fitness cost of R6 virulence occurs regardless of host genotype. In field studies, powdery mildew was suppressed by at least 50% on plants possessing R6 as compared with those without R6 when coinoculated with R6-virulent and avirulent isolates. R6 virulence in P. macularis appears to be race specific and, at this time, imposes a measurable fitness penalty on the fungus. Resistance genes R1 and R2 appear to remain effective against R6-virulent isolates of P. macularis in the U.S. Pacific Northwest.

scholarly journals First Report of Powdery Mildew Caused by Golovinomyces spadiceus on Okra in the United States

Plant Disease ◽  
2018 ◽  
Vol 102 (8) ◽  
pp. 1664-1664 ◽  
Author(s):  
S. Moparthi ◽  
M. Bradshaw ◽  
K. Frost ◽  
P. B. Hamm ◽  
J. W. Buck
Keyword(s):  
United States ◽  
Powdery Mildew ◽  
The United States ◽  
First Report

scholarly journals Perpetuation of Powdery Mildew Infection and Identification of Erysiphe australiana as the Crape Myrtle Pathogen in Mid-Tennessee

Plant Disease ◽  
2006 ◽  
Vol 90 (8) ◽  
pp. 1098-1101 ◽  
Author(s):  
Ainong Shi ◽  
Margaret T. Mmbaga
Keyword(s):  
United States ◽  
Powdery Mildew ◽  
The United States ◽  
Diagnostic Tools ◽  
Specific Primers ◽  
Standard Polymerase Chain Reaction ◽  
Common Lilac ◽  
Pcr Products ◽  
Powdery Mildew Fungi ◽  
Powdery Mildew Pathogen

The fungus Erysiphe lagerstroemiae is commonly known as the powdery mildew pathogen in crape myrtle (Lagerstroemiae indica) in the United States, and Erysiphe australiana is the powdery mildew pathogen reported in Japan, China, and Australia. The teleomorph often used to identify powdery mildew fungi rarely develops in crape myrtle, and in our observations, ascocarps never formed. Our study showed that the crape myrtle pathogen overwintered as mycelia on dormant buds. The internal transcribed spacer (ITS) regions of rDNA and the intervening 5.8S rRNA gene were amplified using standard polymerase chain reaction (PCR) protocols and the universal primer pairs ITS1 and ITS4. PCR products were analyzed by electrophoresis in a 1.5% agarose gel and sequenced, and the ITS PCR product was 666 bp from ITS1/ITS4 and 704 bp from ITS1-F/ITS4. BLAST analysis of the sequence of the PCR products showed identical similarity with E. australiana reported in Japan, China, and Australia. Comparison of ITS sequences with information in the GenBank on other powdery mildew fungi showed a closest alignment (93% similarity) to Erysiphe juglandis that infects walnut. Specific primers for E. australiana were developed and evaluated for use as diagnostic tools. Out of 12 specific primer pairs evaluated, four primer pairs and four double primer pairs were highly specific to E. australiana and did not amplify Erysiphe pulchra of dogwood, Erysiphe syringae of common lilac, Erysiphe circinata of maple, or Phyllactinia guttata of oak. The E. australiana-specific primers amplified 16 samples of crape myrtle powdery mildew collected from diverse locations in mid-Tennessee. These results clearly showed that the crape myrtle powdery mildew in mid-Tennessee was caused by E. australiana. Specific primers reported in this article provide a diagnostic tool and may be used to confirm the identity of crape myrtle powdery mildew pathogen in other areas in the United States and wherever the disease occurs.

scholarly journals Finger Lime: An Alternative Crop with Great Potential in South Florida

EDIS ◽  
2018 ◽  
Vol 2018 (1) ◽  
Author(s):  
Aditya Singh ◽  
Edward A. Evans ◽  
Jeff Wasielewski ◽  
Manjul Dutt ◽  
Jude Grosser
Keyword(s):  
United States ◽  
Resource Economics ◽  
The United States ◽  
South Florida ◽  
Fresh Fruit ◽  
Citrus Fruits ◽  
Fact Sheet ◽  
Alternative Crop ◽  
Economics Department

Cylindrical Australian finger limes (Microcitrus australasica) taste like a combination of lemon, lime, and grapefruit, come in a rainbow of colors, and have a texture like caviar. Like other citrus fruits, finger limes are nutritious, low in calories, and vitamin-rich. So far in the United States only California grows finger limes commercially, but this 4-page fact sheet written by Aditya Singh, Edward Evans, Jeff Wasielewski, Manjul Dutt, and Jude Grosser and published by the UF/IFAS Food and Resource Economics Department makes the case that exotic, colorful finger limes would likely grow well in Florida, where they would appeal to hoteliers and restaurants and to adventurous, health-conscious consumers on the lookout for a delicious new fresh fruit snack to try.  http://edis.ifas.ufl.edu/fe1033

scholarly journals Sawadaea tulasnei Powdery Mildew of Norway Maple (Acer platanoides) in North America

Plant Disease ◽  
2006 ◽  
Vol 90 (6) ◽  
pp. 830-830
Author(s):  
J. Weiland ◽  
G. Stanosz
Keyword(s):  
United States ◽  
New York ◽  
North America ◽  
Powdery Mildew ◽  
Acer Saccharum ◽  
The United States ◽  
Rdna Its ◽  
Maple Leaves ◽  
Norway Maple ◽  
Genus 2

Norway maple leaves bearing powdery mildew were collected from one location in the fall of 2003 and four locations (as much as 1.5 km apart) in the fall of 2005 in Buffalo, NY. No powdery mildew was observed on leaves collected from sugar maples (Acer saccharum) that were present in the vicinity of affected Norway maples at two locations. Trees were located along streets and in yards. Diseased leaves were present throughout tree crowns but lower leaves were more commonly affected. White mycelium was present in irregular, discrete, scattered spots only on the upper surface of leaves and on both sides of wings of samaras. Typically, <10% of the upper leaf area bore visible mycelium. Cleistothecia were present singly or in groups on the mycelium. Morphology of cleistothecia on leaves collected each year, including simple and bifid appendages with uncinate to circinate apices, was sufficient to identify the pathogen to the genus Sawadaea (1). Other characteristics were not sufficiently distinct to make an identification of S. bicornis or S. tulasnei (1), each a European species found on Acer spp. However, a sample from 2003 was supplied by the authors for use in a study of phylogeny of the genus (2) that served as a first report of the species in the United States. Analysis of nuclear rDNA ITS sequence of this specimen (GenBank Accession No. AB193390) placed the sample in a clade with S. tulasnei specimens from Europe. In the same study, powdery mildew samples from Acer spp. in Ohio and Montreal, Canada also were placed in this clade. Thus, occurrence of S. tulasnei in North America is confirmed. S. bicornis was recently identified (based on morphology) on Norway maple in the western United States (3). Specimens from Buffalo, NY have been deposited in the U.S. National Fungus Collections (BPI 871210). References: (1) U. Braun. The Powdery Mildews (Erysiphales) of Europe. Gustav Fischer Verlag, Jena-Stuttgart-New York, 1995. (2) S. Hirose et al. Mycol. Res. 109:912, 2005. (3) C. Nischwitz and G. Newcombe. Plant Dis. 87:451, 2003.

scholarly journals Preventing Foodborne Illness: Listeriosis

EDIS ◽  
2013 ◽  
Vol 2013 (4) ◽  
Author(s):  
Keith R. Schneider ◽  
Renée M. Goodrich-Schneider ◽  
Michael A. Hubbard ◽  
Susanna Richardson
Keyword(s):  
United States ◽  
Pregnant Women ◽  
The United States ◽  
Foodborne Illness ◽  
Human Nutrition ◽  
Foodborne Diseases ◽  
Food Science ◽  
Popular Press ◽  
Fact Sheet ◽  
Affected Person

Listeriosis is one of several foodborne diseases that are often reported in the scientific and popular press. In the United States, it affects about 1,600 people every year, with about 270 of those cases resulting in death. It expresses itself in the affected person by means of septicemia, meningitis, and/or encephalitis. Pregnant women who have intrauterine or cervical infections caused by L. monocytogenes in their second or third trimesters may spontaneously abort the fetus or produce a stillbirth. Influenza-type symptoms, which may include continuous fever, usually precede the aforementioned disorders. This 4-page fact sheet was written by Keith R. Schneider, Renée Goodrich-Schneider, Michael A. Hubbard, and Susanna Richardson, and published by the UF Department of Food Science and Human Nutrition, March 2013. http://edis.ifas.ufl.edu/fs102

scholarly journals Melons: Safe Handling Practices for Consumers

EDIS ◽  
2013 ◽  
Vol 2013 (6) ◽  
Author(s):  
Amy Simonne
Keyword(s):  
United States ◽  
Food Safety ◽  
The United States ◽  
Farmers Market ◽  
Safety Practices ◽  
Safe Handling ◽  
Fact Sheet ◽  
Handling Practices ◽  
Honeydew Melon

Since most of us buy melons at the store or farmers market, it is easy to forget that most melons are grown on the ground. Watermelons, cantaloupe, and honeydew melon are the most popular varieties of melons in the United States. Because they are exposed to pests and microorganisms from dirt, it is very important to apply the best food safety practices before enjoying them. This 3-page fact sheet was written by Amy Simonne, and published by the UF Department of Family Youth and Community Sciences, June 2013. http://edis.ifas.ufl.edu/fy488

scholarly journals First Report of Powdery Mildew Caused by Podosphaera aphanis var. aphanis on Potentilla fruticosa in Italy

Plant Disease ◽  
2005 ◽  
Vol 89 (12) ◽  
pp. 1362-1362
Author(s):  
A. Garibaldi ◽  
D. Bertetti ◽  
M. L. Gullino
Keyword(s):  
United States ◽  
Powdery Mildew ◽  
The United States ◽  
Pathogenicity Test ◽  
First Report ◽  
Potentilla Fruticosa ◽  
Erysiphe Polygoni ◽  
Voucher Specimens ◽  
White Mycelium ◽  
Sphaerotheca Macularis

Potentilla fruticosa L. (bush cinquefoil), belonging to the family Rosaceae, is an ornamental plant used in parks and gardens. During the spring and summer of 2005, severe outbreaks of a previously unknown powdery mildew were observed in several private gardens located near Biella (northern Italy). The adaxial and abaxial surfaces of leaves as well as the stems were covered with white mycelium. Buds and flowers also were affected. As disease progressed, infected leaves turned yellow and dehisced. Conidia formed in chains and were hyaline, ovoid, and measured 24.0 to 36.0 × 15.8 to 24.0 μm (average 30.1 × 20.0 μm). Fibrosin bodies were present. Chasmothecia were numerous, sphaerical, amber colored, and diameters ranged from 84.0 to 98.4 μm (average 90.4 μm). Each chasmothecium contained one ascus with eight ascospores. Ascospores measured 26.5 to 27.2 × 13.2 to 15.6 μm (average 26.8 × 14.0 μm). On the basis of its morphology, the causal agent was determined to be Podosphaera aphanis (Wallr.) U. Braun & S. Takamatsu var. aphanis U. Braun (1). Pathogenicity was confirmed through inoculations by gently pressing diseased leaves onto leaves of healthy P. fruticosa plants. Three plants were inoculated. Three noninoculated plants served as a control. Plants were maintained at temperatures ranging from 12 to 23°C. Ten days after inoculation, typical symptoms of powdery mildew developed on inoculated plants. Noninoculated plants did not show symptoms. The pathogenicity test was carried out twice. To our knowledge, this is the first report of powdery mildew on P. fruticosa in Italy. Erysiphe polygoni D.C. and Sphaerotheca macularis (Wallr.:Fr.) Lind were observed in the United States on P. fruticosa (2), while in Japan, the presence of S. aphanis var aphanis was reported (3). Voucher specimens are available at the AGROINNOVA Collection, University of Torino. References: (1) U. Braun and S. Takamatsu. Schlechtendalia 4:1, 2000 (2) D. F. Farr et al. Fungi on Plants and Plant Products in the United States. The American Phytopathological Society, St Paul, MN, 1989. (3) S. Tanda et al. J. Agric. Sci. 39:258, 1995.

scholarly journals First confirmed report of powdery mildew (Erysiphe sp.) on Plumeria pudica in the United States

2017 ◽  
Vol 36 ◽  
pp. 3 ◽  
Author(s):  
S.N. Suarez ◽  
G. Sanahuja ◽  
P. Lopez ◽  
D.L. Caldwell
Keyword(s):  
United States ◽  
Powdery Mildew ◽  
The United States
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