Impact de la maladie des points noirs sur la biologie du complexe Phoxinus (Cyprinidae) du lac Fortune, Québec

1994 ◽  
Vol 72 (9) ◽  
pp. 1611-1615 ◽  
Author(s):  
Anne Reine Paradis ◽  
François Chapleau
Keyword(s):  
Gonadosomatic Index ◽  
Black Spot ◽  
Condition Index ◽  
The Body ◽  
Spot Disease ◽  
Total Length ◽  
Predictive Parameters ◽  
Black Spots ◽  
Black Spot Disease

The purpose of this study was to quantify the effects of the black spot disease on growth, health, and fecundity of the fish and to define predictive parameters related to the infestation. Cyprinids belonging to the Phoxinus complex (P. eos, P. eos × P. neogaeus) of Lake Fortune (Gatineau Park, Québec, Canada) were sampled periodically between June and September 1992. The highest intensity of infestation was encountered in September (0–216 black spots; [Formula: see text], SD = 26.0). Our results indicate that: (i) the condition index of the Phoxinus complex and the gonadosomatic index in females are not affected by the level of infestation; (ii) age is a better predictive parameter of the number of black spots than total length; (iii) fins are significantly more infested than the body; and (iv) infestation occurs mainly between June and September. Our results suggest that the black spot disease does not influence the biology of fish belonging to the Phoxinus complex, even in instances of severe infestation.

scholarly journals Characterization of Alternaria alternata Causing Black Spot Disease of Pomegranate in Israel Using a Molecular Marker

Plant Disease ◽  
2012 ◽  
Vol 96 (10) ◽  
pp. 1513-1518 ◽  
Author(s):  
Tami Gat ◽  
Orna Liarzi ◽  
Yulia Skovorodnikova ◽  
David Ezra
Keyword(s):  
Molecular Marker ◽  
Alternaria Alternata ◽  
Severe Disease ◽  
Outer Part ◽  
Black Spot ◽  
Spot Disease ◽  
Black Spots ◽  
Detached Leaves ◽  
Pathogenicity Tests ◽  
Black Spot Disease

Black spot disease of pomegranate is a relatively new disease in Israel that is caused by Alternaria alternata. The symptoms include black spots on leaves and fruit. Only the outer part of the fruit is damaged; the edible tissue remains unaffected. In this study, we obtained 50 isolates of A. alternata from infected pomegranate plants that were classified based on pathogenicity tests using detached leaves. Using an arbitrarily primed polymerase chain reaction, we identified one primer (primer CAG) that reacted only with DNA of isolates that induced the most severe disease symptoms. Based on the sequence of the amplified fragment, we generated a specific primer (primer C) that recognizes these highly virulent isolates. Therefore, we suggest that primer C can be utilized as a molecular marker for the detection of A. alternata isolates that cause black spot disease of pomegranate.

scholarly journals The occurence of black spot disease in Astyanax aff. fasciatus(characiformes: characidae) in the Guaíba Lake basin, RS, Brazil

2014 ◽  
Vol 74 (3 suppl 1) ◽  
pp. S127-S134 ◽  
Author(s):  
F Flores-Lopes
Keyword(s):  
Low Frequency ◽  
Black Spot ◽  
Lake Basin ◽  
Body Parts ◽  
Spot Disease ◽  
Black Spots ◽  
Digenetic Trematodes ◽  
Fish Samples ◽  
High Prevalence ◽  
Black Spot Disease

Black spot disease is common in freshwater fish and is usually caused by the metacercaria stage of digenetic trematodes, normally from the Diplostomidae family. The present study evaluated the prevalence and intensity of this disease in Astyanax aff. fasciatus(Teleostei: Characiformes) in the Guaíba Lake basin (RS, Brazil), including body parts assessment and the points of sampling with higher occurrence of black spots. Fish samples were taken seasonally from December 2002 until October 2004. The samples were collected with the use of a seine net at eleven points. The specimens were fixed in 10% formalin and stored in 70% ethanol. Black spot disease showed a low frequency in the Guaíba lake basin (2.07%) and no specificity to the species Astyanax aff. fasciatus was observed. A high prevalence among the individuals and high intensity of infection levels was found in the ventral and dorsal regions in relation to other body parts (e.g., pectoral, pelvic and anal regions). Among the sampling points studied, we observed a higher prevalence on samples collected at points Gasômetro, Saco da Alemoa and Sinos, located in open areas with less occurrence of mollusks.

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

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

Genetic mapping of genes for susceptibility to black spot disease in Japanese pears

Genome ◽  
2007 ◽  
Vol 50 (8) ◽  
pp. 735-741 ◽  
Author(s):  
S. Terakami ◽  
Y. Adachi ◽  
H. Iketani ◽  
Y. Sato ◽  
Y. Sawamura ◽  
...  
Keyword(s):  
Black Spot ◽  
Japanese Pear ◽  
Pyrus Pyrifolia ◽  
Breeding Programs ◽  
Spot Disease ◽  
Genome Scanning ◽  
A Genome ◽  
Susceptibility And Resistance ◽  
Different Sources ◽  
Black Spot Disease

Black spot disease, which is caused by the Japanese pear pathotype of Alternaria alternata (Fr.) Keissler, is one of the most harmful diseases in Japanese pear cultivation. We identified the exact positions and linkage groups (LGs) of the genes for susceptibility to black spot in the Japanese pear ( Pyrus pyrifolia Nakai) cultivars ‘Osa Nijisseiki’ (gene Ani) and ‘Nansui’ (gene Ana). Segregation of susceptibility and resistance fitted the expected ratio of 1:1 in progeny of ‘Nansui’ but showed a slight distortion in progeny of ‘Osa Nijisseiki’. We mapped the genes for susceptibility to black spot in both populations using a genome scanning approach. The simple sequence repeat (SSR) markers CH04h02 and CH03d02 showed tight linkage to Ani and Ana. Although Ani and Ana are derived from different sources, both genes are located at the top region of LG 11. Information about the positions of the susceptibility genes and the molecular markers linked to them will be useful for marker-assisted selection in pear breeding programs.

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