Microscopic evidence for the hemibiotrophic nature of Diplocarpon rosae, cause of black spot disease of rose

2006 ◽  
Vol 69 (1-3) ◽  
pp. 86-92 ◽  
Author(s):  
E.W. Gachomo ◽  
H.-W. Dehne ◽  
U. Steiner
Keyword(s):  
Black Spot ◽  
Spot Disease ◽  
Diplocarpon Rosae ◽  
Microscopic Evidence ◽  
Black Spot Disease

scholarly journals An Updated Host Differential Due to Two Novel Races of Diplocarpon rosae Wolf, the Causal Agent of Rose Black Spot Disease

HortScience ◽  
2020 ◽  
Vol 55 (11) ◽  
pp. 1756-1758
Author(s):  
David C. Zlesak ◽  
Darcy Ballantyne ◽  
Matthew Holen ◽  
Andrea Clark ◽  
Stan C. Hokanson ◽  
...  
Keyword(s):  
Fungal Pathogen ◽  
Durable Resistance ◽  
Black Spot ◽  
Ongoing Research ◽  
Knock Out ◽  
Spot Disease ◽  
Diplocarpon Rosae ◽  
Leaf Chlorosis ◽  
New Races ◽  
Black Spot Disease

The fungal pathogen, Diplocarpon rosae, infects only roses (Rosa spp.) and leads to rose black spot disease. Rose black spot is the most problematic disease of outdoor-grown roses worldwide due to the potential for rapid leaf chlorosis and defoliation. Eleven races of the pathogen were previously characterized from isolates collected in North America and Europe. Isolates of D. rosae obtained from infected leaves of the roses Brite EyesTM (‘RADbrite’; isolate BEP; collected in West Grove, PA) and Oso Easy® Paprika (‘CHEwmaytime’; isolate PAP; collected in Minneapolis, MN) proved to have unique infection patterns using the established host differential with the addition of Lemon FizzTM (‘KORlem’). The new races are designated race 12 (BEP) and race 13 (PAP), respectively, and Lemon FizzTM should be included in the updated host differential because it distinguishes races 7 and 12. Additionally, inconsistent infections and limited sporulation were found in the host differential Knock Out® (‘RADrazz’) for races 7 and 12. Expanding the collection of D. rosae races supports ongoing research efforts, including host resistance gene discovery and breeding new rose cultivars with increased and potentially durable resistance.

scholarly journals Characterization of Partial Resistance to Black Spot Disease of Rosa sp.

HortScience ◽  
2017 ◽  
Vol 52 (1) ◽  
pp. 49-53 ◽  
Author(s):  
Qianni Dong ◽  
Xinwang Wang ◽  
David H. Byrne ◽  
Kevin Ong
Keyword(s):  
Partial Resistance ◽  
Black Spot ◽  
Lesion Length ◽  
Horizontal Resistance ◽  
Narrow Sense Heritability ◽  
Spot Disease ◽  
Diplocarpon Rosae ◽  
Whole Plant ◽  
Black Spot Disease

Black spot disease, caused by the fungus Diplocarpon rosae Wolf, is one of the most serious diseases of garden roses. Both complete (vertical) resistance conditioned by dominant Rdr genes and partial (horizontal) resistance conditioned by multiple genes have been described. The use of resistant rose cultivars would reduce the demand of agrochemical applications. The characterization of 16 genotypes for resistance to black spot using two laboratory assays, the detached leaf assay (DLA) and the whole plant inoculation (WPI) approach, indicated that these techniques were well correlated. Thus, either method could be used to assess the resistance of the plants to black spot. Fifteen diploid hybrid populations from 10 parents segregating for partial (horizontal) resistance to black spot derived from Rosa wichuraiana ‘Basye’s Thornless’ (RW) were assessed for black spot resistance by quantifying the percentage of the leaf area with symptoms (LAS) and lesion length (LL) measured by the diameter of the largest lesion per leaf in DLAs. The narrow-sense heritability of partial resistance to black spot as measured by LAS and LL data of DLA was estimated to be from 0.28 to 0.43 when calculated with a genetic variance analysis and from 0.74 to 0.86 when generated from offspring–midparent regression. This suggests that the development of rose cultivars with high levels of stable partial resistance to black spot is a feasible approach for the rose industry.

scholarly journals Survey and Pathogenicity of Black Spot Disease of Rose in Pakistan

2016 ◽  
Vol 03 (04) ◽  
Author(s):  
Yasin NA ◽  
Ahmed S ◽  
Khan WU ◽  
Ashraf Y
Keyword(s):  
Black Spot ◽  
Spot Disease ◽  
Black Spot Disease

scholarly journals Selection of Mutant Japanese Pears Resistant to Black Spot Disease by Acute Irradiation of Gamma-rays

1994 ◽  
Vol 62 (4) ◽  
pp. 701-706 ◽  
Author(s):  
Kenji Murata ◽  
Kenichi Kitagawa ◽  
Testuo Masuda ◽  
Kosuke Inoue ◽  
Kazuo Kotobuki ◽  
...  
Keyword(s):  
Gamma Rays ◽  
Black Spot ◽  
Spot Disease ◽  
Acute Irradiation ◽  
Selection Of ◽  
Black Spot Disease

Black spot disease ofLentinula edodescaused by theHyphozymasynanamorph ofEleutheromyces subulatus

Mycologia ◽  
1997 ◽  
Vol 89 (6) ◽  
pp. 867-875 ◽  
Author(s):  
Akihiko Tsuneda ◽  
Shigeyuki Murakami ◽  
Warwick M. Gill ◽  
Nitaro Maekawa
Keyword(s):  
Black Spot ◽  
Spot Disease ◽  
Black Spot Disease

scholarly journals Black spot disease of European pear, a new disease caused by Alternaria alternate, (Fries: Fries) Keissler.

2004 ◽  
Vol 70 (3) ◽  
pp. 168-175 ◽  
Author(s):  
M. TANAHASHI ◽  
Y. YAMAGUCHI ◽  
Y. YOKOYAMA ◽  
H. OTANI
Keyword(s):  
Black Spot ◽  
New Disease ◽  
European Pear ◽  
Spot Disease ◽  
Alternaria Alternate ◽  
Black Spot Disease

In vivo testing of antagonistic fungi against Alternaria brassicicola causing Chinese kale black spot disease

2020 ◽  
Author(s):  
Atima Komhorm ◽  
Suttipong Thongmee ◽  
Todsawat Thammakun ◽  
Thanaprasong Oiuphisittraiwat ◽  
Arom Jantasorn
Keyword(s):  
Black Spot ◽  
Alternaria Brassicicola ◽  
Spot Disease ◽  
Antagonistic Fungi ◽  
Chinese Kale ◽  
In Vivo Testing ◽  
Black Spot Disease
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