Occurrence of Skin Blemish Diseases (Scab and Scurf) in Norwegian Potato Production

Nærstad, Ragnhild; Dees, Merete Wiken; Le, Vinh Hong; Holgado, Ricardo; Hermansen, Arne

doi:10.1007/s11540-012-9221-x

Cited by 18 publications

(15 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The common scab severity was scored visually as percentage cover of symptoms on the tubers surface, as previously described by Naerstad et al (2012). The assessment was supported by a key with illustrations of various coverage percentages.…”

Section: Experimental Set-upmentioning

confidence: 99%

High soil moisture reduces common scab caused byStreptomyces turgidiscabiesandStreptomyces europaeiscabieiin potato

Johansen

Dees

Hermansen

2014

Acta Agriculturae Scandinavica, Section B — Soil & Plant Sc

Self Cite

View full text Add to dashboard Cite

Common scab (Streptomyces spp.) is a worldwide economic important disease of potato (Solanum tuberosum L.) because it degrades the appearance of the tubers and thereby decreases market value. For the newly reported Streptomyces turgidiscabies and Streptomyces europaeiscabiei in Norway, little is known about their specific environmental requirements, particularly their pathogenicity under varying moisture levels. Scab development after soil inoculation of S. turgidiscabies and S. europaeiscabiei in dry, normal and wet soils was studied in three pot experiments (2009-2011) under controlled climate conditions at natural light in Tromsø, Norway (69.7 N). With increased soil moisture, statistical significant reductions in scab severity were found in two out of three experiments for S. turgidiscabies (about 50% reduction). Similarly, scab caused by S. europaeiscabiei was reduced significantly in one experiment (65% reduction), and with a tendency of reduction in the other experiments. Scab development from seed-transmitted inoculum was investigated for both species. In one trial with four scab severity levels on mother tubers (0%, 10%, 30% and 50% of surface covered), we found that seed-transmitted disease development occurred for both species although few lesions were recorded. There were no significant differences in scab severity on progeny tubers, no matter the infection levels on seed tubers. These results indicate that seed tubers might play a minor role for transmitting common scab for S. turgidiscabies and S. europaeiscabiei, but further work is warranted. Related to growers practice, the results implicate that potato common scab caused by S. europaeiscabiei and S. turgidiscabies may be reduced by irrigation during the early stages of tuber formation, similar to currently recommended control measures for Streptomyces scabies.

show abstract

Section: Experimental Set-upmentioning

confidence: 99%

High soil moisture reduces common scab caused byStreptomyces turgidiscabiesandStreptomyces europaeiscabieiin potato

Johansen

Dees

Hermansen

2014

Acta Agriculturae Scandinavica, Section B — Soil & Plant Sc

Self Cite

View full text Add to dashboard Cite

show abstract

“…Potato tuber blemishes are caused by Rhizoctonia solani, Spongospora subterranea f. sp. subterranea, Helminthosporium solani, Colletotrichum coccodes, Fusarium species and Streptomyces species inter alia (Naerstad et al 2012). These pathogens have been associated with black scurf, powdery scab, silver scurf, black dot, dry rot and common scab symptoms on tubers resulting in reduced yield and quality (Tsror et al 1999;Naerstad et al 2012).…”

Section: Introductionmentioning

confidence: 99%

“…subterranea, Helminthosporium solani, Colletotrichum coccodes, Fusarium species and Streptomyces species inter alia (Naerstad et al 2012). These pathogens have been associated with black scurf, powdery scab, silver scurf, black dot, dry rot and common scab symptoms on tubers resulting in reduced yield and quality (Tsror et al 1999;Naerstad et al 2012). Potato tuber blemishes are also caused by viruses and nematodes (Holgado et al 2009;Carnegie and McCreath, 2010;.…”

Section: Introductionmentioning

confidence: 99%

“…Superficial blemishes also offer entry points for opportunistic pathogens that may lead to tuber rotting. They increase tuber skin permeability and increase water loss resulting in shrivelling of produce in storage (Naerstad et al 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Knowledge of the causal agents of these blemishes and their biology is paramount in formulating effective and practical management tactics and enable the incorporation of atypical tuber blemishes in potato seed certification schemes. This will reduce their impact on the quality of produce (Naerstad et al 2012). A preliminary survey of tuber blemishes showed that fungal pathogens are the primary causal agents of tuber blemishes in South Africa (results not shown).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Pathogenicity of Fungi Isolated from Atypical Skin Blemishes on Potatoes in South Africa and Zimbabwe

2017

View full text Add to dashboard Cite

Potato skin blemishes with known causes (typical blemishes) are manageable compared to those with unknown causes (atypical blemishes). This study investigated possible fungal causal agents of atypical tuber blemishes in South Africa and Zimbabwe through isolation and pathogenicity testing. Several fungal genera were isolated from elephant hide, corky cracks, star-shaped lesions, circular corky lesions, raised corky spots, enlarged lenticels and russetting. Koch's postulates were fulfilled for binucleate Rhizoctonia (BNR) AG A, Macrophomina phaseolina and Rhizoctonia solani AG 3-PT. BNR AG A isolates from South African tubers of cv. Up-to-Date reproduced circular and linear defects on tubers. Koch's postulates could not be fulfilled with the remaining isolates, as re-isolation proved impossible. M. phaseolina isolates inoculated on South African cv. Mondial reproduced dark, circular lesions around lenticels conforming to typical symptoms of charcoal rot on potato tubers. R. solani AG 3-PT isolates reproduced corky cracks with elephant hide and black scurf with similar aggressiveness on cvs Mondial (South Africa) and Diamond (Zimbabwe). This is the first report of charcoal rot caused by M. phaseolina, and of tuber defects caused by BNR AG A on potato in South Africa. This is also the first report of tuber cracking and elephant hide caused by R. solani AG 3-PT on potato in Zimbabwe. The findings from this work are crucial in formulating control strategies against these pathogens in order to improve potato tuber quality on the market.

show abstract

Contemporary Management of Insect Pests in Rice

Shah

Razaq

Islam

2022

Modern Techniques of Rice Crop Production

View full text Add to dashboard Cite

Occurrence of Skin Blemish Diseases (Scab and Scurf) in Norwegian Potato Production

Cited by 18 publications

References 27 publications

High soil moisture reduces common scab caused byStreptomyces turgidiscabiesandStreptomyces europaeiscabieiin potato

High soil moisture reduces common scab caused byStreptomyces turgidiscabiesandStreptomyces europaeiscabieiin potato

Pathogenicity of Fungi Isolated from Atypical Skin Blemishes on Potatoes in South Africa and Zimbabwe

Contemporary Management of Insect Pests in Rice

Contact Info

Product

Resources

About