Partial Resistance to Potato Black Dot, Caused by Colletotrichum coccodes in Solanum tuberosum Group Andigena

2010 ◽  
Vol 87 (6) ◽  
pp. 502-508 ◽  
Author(s):  
Nadav Nitzan ◽  
Richard A. Quick ◽  
Will D. Hutson ◽  
John Bamberg ◽  
Chuck R. Brown
Keyword(s):  
Solanum Tuberosum ◽  
Partial Resistance ◽  
Colletotrichum Coccodes ◽  
Black Dot ◽  
Potato Black Dot

scholarly journals Effect of Seed-Tuber Generation, Soilborne Inoculum, and Azoxystrobin Application on Development of Potato Black Dot Caused by Colletotrichum coccodes

Plant Disease ◽  
2005 ◽  
Vol 89 (11) ◽  
pp. 1181-1185 ◽  
Author(s):  
N. Nitzan ◽  
T. F. Cummings ◽  
D. A. Johnson
Keyword(s):  
Disease Severity ◽  
Seed Tuber ◽  
Russet Burbank ◽  
Yield Reduction ◽  
Colletotrichum Coccodes ◽  
Potato Seed ◽  
Disease Development ◽  
Black Dot ◽  
Potato Black Dot

The effect of azoxystrobin on potato black dot and the role of seed- and soilborne inocula of Colletotrichum coccodes in the development of black dot were evaluated in the field using two potato seed generations (generation 1 and 3) of the susceptible cvs. Norkotah Russet and Russet Burbank over 3 years (2002 to 2004). Plants of Norkotah Russet and Russet Burbank treated with azoxystrobin had 13 and 23% higher yields, respectively, than nontreated plants in 2003. Disease severity on both cultivars was reduced 19 to 81%, and 22 to 81% on above- and belowground stem sections, respectively, when plants were treated with azoxystrobin. Plants of both cultivars that were treated with azoxystrobin had 9 to 26% less infected progeny tubers than the nontreated plants. These results indicated the efficacy of azoxystrobin to reduce black dot severity on both stems and progeny tubers. The roles of seed- and soilborne inocula in disease development were evaluated in 2003 and 2004 using generation 1 and 3 seed tubers. The incidence of C. coccodes in generation 1 mother tubers of Norkotah Russet and Russet Burbank were 2 and 16% in 2003, respectively, and 0 and 30% in 2004, respectively. The incidence of C. coccodes in generation 3 mother tubers of Norkotah Russet and Russet Burbank were 14 and 49% in 2003, respectively, and 12 and 38% in 2004, respectively. Generation 1 plants of Norkotah Russet had 36 and 13% greater yield than generation 3 plants in 2003 and 2004, respectively. In 2004, generation 1 plants of Norkotah Russet and Russet Burbank had 26 and 15% greater disease severity, respectively, on belowground stem than generation 3 plants. Generation 1 plants of Norkotah Russet had 7.5 and 11% more infected progeny tubers in 2003 and 2004, respectively, than generation 3. Significant differences for yield reduction and incidence of infected progeny tubers between the two seed generations were not recorded for Russet Burbank, suggesting that the effect of inoculum source of C. coccodes on black dot severity may be cultivar specific.

scholarly journals First Report of Potato Black Dot Caused by Colletotrichum coccodes in Hebei Province of China

Plant Disease ◽  
2019 ◽  
Vol 103 (10) ◽  
pp. 2669-2669
Author(s):  
Zaimin Tian ◽  
Yuhuan Wu ◽  
Huijing Guo ◽  
Xuechen Gong ◽  
Hongjie Zhang
Keyword(s):  
Hebei Province ◽  
Colletotrichum Coccodes ◽  
Black Dot ◽  
First Report ◽  
Potato Black Dot

scholarly journals Insights on the Structural and Metabolic Resistance of Potato (Solanum tuberosum) Cultivars to Tuber Black Dot (Colletotrichum coccodes)

2020 ◽  
Vol 11 ◽  
Author(s):  
Josep Massana-Codina ◽  
Sylvain Schnee ◽  
Pierre-Marie Allard ◽  
Adriano Rutz ◽  
Julien Boccard ◽  
...  
Keyword(s):  
Solanum Tuberosum ◽  
Colletotrichum Coccodes ◽  
Black Dot ◽  
Metabolic Resistance

scholarly journals Occurrence of Black Dot of Potato Caused by Colletotrichum coccodes in Central Italy

Plant Disease ◽  
2002 ◽  
Vol 86 (5) ◽  
pp. 562-562 ◽  
Author(s):  
R. Buonaurio ◽  
G. Natalini ◽  
L. Covarelli ◽  
C. Cappelli
Keyword(s):  
Solanum Tuberosum L ◽  
Disease Incidence ◽  
Central Italy ◽  
Morphological Characteristics ◽  
Fungal Growth ◽  
Soil Surface ◽  
The United States ◽  
Colletotrichum Coccodes ◽  
Tuber Quality ◽  
Black Dot

Between 1997 and 2000, black dot of potato (Solanum tuberosum L.), caused by the polyphagous soilborne fungus Colletotrichum coccodes (Wallr.) Hughes, was observed each summer in fields located in Umbria (central Italy). Disease incidence ranged from 50 to 100%, and early potato cultivars were generally more susceptible than late-maturing ones. Disease symptoms were first observed during August as a yellowing and wilting of foliage in the tops of plants, followed by rotting of the roots and stems, which led to the premature death of 50 to 70% of plants. Setose1 sclerotia (300 to 500 mm in diameter) and acervuli of the fungus were found on roots and stems of infected plants. Acervuli produced hyaline, aseptate, cylindrical conidia (16 to 22 × 2.5 to 4.5 μm) formed on unicellular cylindrical phialidic conidiophores. The fungus was isolated from diseased stems and roots on potato dextrose agar (PDA) at pH 6.5. Pathogenicity of the fungus was confirmed by fulfilling Koch's postulates using 3- to 4-week-old potato plants of a local cultivar. A superficial 5-mm vertical cut was made with a scalpel into the base of potato stems (2 cm beneath the soil surface), and 5-mm-diameter plugs of PDA alone (control plants) or PDA plus fungal growth were placed over the cuts. The wounds were sealed with wet cotton swabs that were held in place with Parafilm. Symptoms that resembled those in the field were observed on inoculated plants 6 to 8 weeks postinoculation. Symptoms did not appear on the control plants. The same fungus was reisolated from the diseased plants. Based on morphological characteristics of sclerotia, acervuli, and conidia, as well as pathogenicity tests, the fungus was identified as C. coccodes. To our knowledge, this is the first report of C. coccodes as the causal agent of black dot of potato in central Italy. We did not observe foliar outbreaks of the disease, which were reported from the United States (2). In both 1921 (1) and 1951 (3), the fungus was reported to cause severe outbreaks of the disease in northern Italy. Since then, its presence in Italy has been rarely recorded in potato (4). The occurrence of extremely dry and hot weather conditions during the summers of 1997 to 2000, which are favorable for disease development, made the disease particularly severe. We cannot exclude the possibility that the disease may have been present in central Italy before our observations, as it can be misdiagnosed and its symptoms can be masked by the symptoms of other diseases. The significance of black dot in central Italy needs to be reappraised in terms of both yield loss and tuber quality. References: (1) C. Arnaudi. Atti Ist. Bot. Univ. Pavia. Ser. 3, 1:71, 1924. (2) A. W. Barkdoll and J. R. Davis. Plant Dis. 76:131, 1992. (3) G. Goidanich. Inf. Fitopatol. 1:5, 1951. (4) S. Vitale et al. J. Plant Pathol. 80:265, 1998.

Colletotrichum coccodes: A Pathogen of Eastern Black Nightshade (Solanum ptycanthum)

Weed Science ◽  
1985 ◽  
Vol 33 (6) ◽  
pp. 902-905 ◽  
Author(s):  
Robert N. Andersen ◽  
H. Lynn Walker
Keyword(s):  
Solanum Tuberosum ◽  
Lycopersicon Esculentum ◽  
Colletotrichum Coccodes ◽  
Disease Development ◽  
Highly Pathogenic ◽  
Disease Symptoms ◽  
Eastern Black Nightshade ◽  
Solanum Ptycanthum ◽  
Black Nightshade ◽  
Weedy Species

The fungusColletotrichum coccodes(Wallr.) Hughes was isolated from diseased plants of eastern black nightshade (Solanum ptycanthumDun. ♯ SOLPT) growing in the field. In greenhouse experiments, the isolate was highly pathogenic to eastern black nightshade and less so to seven other weedy species within the Solanaceae. No disease symptoms were observed on seedlings of tomato (Lycopersicon esculentumMill.), potato (Solanum tuberosumL.), or 10 other species inoculated with the isolate. Dew periods of 16 h or longer were required for maximum disease development. This requirement could limit the practical use of this pathogen as a my coherbicide.

Pathogenicity of Colletotrichum coccodes Isolates to Potato (Solanum tuberosum) and Two Nightshade (Solanum spp.) Species

1991 ◽  
Vol 5 (3) ◽  
pp. 570-574 ◽  
Author(s):  
Charlotte V. Eberlein ◽  
Anne W. Barkdoll ◽  
James R. Davis
Keyword(s):  
Solanum Tuberosum ◽  
Colletotrichum Coccodes ◽  
Symptom Development ◽  
Fresh Weight ◽  
Eastern Black Nightshade ◽  
Hairy Nightshade ◽  
Black Nightshade ◽  
Tuber Fresh Weight ◽  
Potato Foliage ◽  
Solanum Spp

Pathogenicity of four Colletotrichum coccodes isolates to potato, eastern black nightshade, and hairy nightshade was evaluated in greenhouse studies. Three Idaho isolates, AC-14, AC-28, and AC-44, and an isolate obtained from Mycogen Corporation, AC-Myc, produced lesions on potato foliage. Plants inoculated with AC-14, AC-28, and AC-44 also showed wilt symptoms similar to those produced by Verticillium dahliae as potatoes were beginning to senesce. Infection by AC-44 reduced tuber fresh weight and specific gravity. All isolates colonized eastern black and hairy nightshade, although some isolates caused little or no symptom development. Thus, both species may serve as sources of primary inoculum for C. coccodes isolates that are pathogenic to potatoes. Only AC-Myc substantially injured the leaves of both nightshade species. AC-Myc was more pathogenic to eastern black than to hairy nightshade, and to plants inoculated at the 3- to 4-leaf versus the 7- to 8-leaf stage.

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