scholarly journals Influence of abiotic factors, inoculum source, and cultivar susceptibility on the potato tuber blemish diseases black dot ( Colletotrichum coccodes ) and silver scurf ( Helminthosporium solani )

2021 ◽  
Author(s):  
Josep Massana‐Codina ◽  
Sylvain Schnee ◽  
Nicole Lecoultre ◽  
Eric Droz ◽  
Brice Dupuis ◽  
...  
Keyword(s):  
Potato Tuber ◽  
Abiotic Factors ◽  
Colletotrichum Coccodes ◽  
Silver Scurf ◽  
Helminthosporium Solani ◽  
Black Dot ◽  
Inoculum Source ◽  
Cultivar Susceptibility

Effects of windrowing, irrigation and defoliation of potatoes on silver scurf (Helminthosporium solani) disease

1993 ◽  
Vol 121 (1) ◽  
pp. 47-53 ◽  
Author(s):  
D. M. Firman ◽  
E. J. Allen
Keyword(s):  
Potato Variety ◽  
Field Experiments ◽  
Colletotrichum Coccodes ◽  
Silver Scurf ◽  
Helminthosporium Solani ◽  
Black Dot ◽  
Early Crop ◽  
Irrigation Regimes ◽  
One Year ◽  
Drying Conditions

SUMMARYField experiments with the potato variety Desiree at Cambridge, UK, in 1988–90 examined the effects of windrowing on the development of blemishing diseases during storage on tubers from crops grown with differing irrigation regimes and dates of defoliation and harvest. Irrigation reduced levels of silver scurf (Helminthosporium solani) at harvest in all three years and increased black dot (Colletotrichum coccodes) in one year. Early crop defoliation slightly increased silver scurf at harvest in one year only. Silver scurf developed less during storage at 3 °C than at 7 °C and disease levels on tubers after storage were related to levels present at harvest. The effects of leaving tubers for up to 6 h in a windrow at harvest on silver scurf after storage were small and inconsistent between years despite similar drying conditions. The results suggest that windrowing may be of little practical use in controlling silver scurf during storage.

Ultrastructure of the infection process of potato tuber by Helminthosporium solani, causal agent of potato silver scurf

2004 ◽  
Vol 108 (7) ◽  
pp. 828-836 ◽  
Author(s):  
Carole Martinez ◽  
Danny Rioux ◽  
Russell J. Tweddell
Keyword(s):  
Potato Tuber ◽  
Infection Process ◽  
Causal Agent ◽  
Silver Scurf ◽  
Helminthosporium Solani

Occurrence, development, and losses associated with silver scurf and black dot on Colorado potatoes

1979 ◽  
Vol 56 (6) ◽  
pp. 289-306 ◽  
Author(s):  
Robert M. Hunger ◽  
Gary A. McIntyre
Keyword(s):  
Silver Scurf ◽  
Black Dot

scholarly journals Occurrence and epidemiological aspects of potato silver scurf in California

2004 ◽  
Vol 22 (4) ◽  
pp. 690-695 ◽  
Author(s):  
Marcos G. Cunha ◽  
David M. Rizzo
Keyword(s):  
Storage Period ◽  
Storage Conditions ◽  
Silver Scurf ◽  
Inoculum Potential ◽  
Helminthosporium Solani ◽  
Potato Tubers ◽  
Commercial Potato ◽  
Tuber Disease ◽  
Fusarium Sp ◽  
Over Time

A new potato tuber disease has been observed in the Tulelake region, California, USA, since 1995, with tuber symptoms suggestive of silver scurf disease (Helminthosporium solani). In this work we isolated, identified and demonstrated the nature of the causal agent of this potato disease in California. In addition, the distribution of H. solani in potato fields and the inoculum potential at harvest time were investigated. Disease progress and H. solani spore populations were also characterised under commercial storage conditions. The main fungal genera associated with potato tubers in storage were Helminthosporium solani, Colletotrichum sp., Fusarium sp., and Rhizoctonia sp. The results of Koch's postulates indicated that H. solani is responsible for the outbreak of silver scurf in the Tulelake region. In a disease survey in three commercial potato fields naturally infested, H. solani infections occurred in all fields. However, the extension of the infections differed significantly between the fields. During potato storage, silver scurf usually increased over time. The percentage of the tuber surface covered by silver scurf varied from 3.5% up to 35.5% during the storage period. The number of H. solani lesions per tuber also progressively increased from 6% up to 35%, six months after storage. H. solani spore populations also increased over time in all studied potato stores; nevertheless, they followed no consistent pattern, exhibiting multiple and variable peaks of increase and reduction during the period of storage.

Effects of silver scurf (Helminthosporium solani) on seed potatoes

1984 ◽  
Vol 27 (2) ◽  
pp. 145-154 ◽  
Author(s):  
P. J. Read ◽  
G. A. Hide
Keyword(s):  
Silver Scurf ◽  
Helminthosporium Solani ◽  
Seed Potatoes

scholarly journals The usefulness of chitosan and Pythium oligandrum in potato tuber protection against Helminthosporium solani

2008 ◽  
Vol 20 (2) ◽  
pp. 67-74
Author(s):  
Halina Kurzawińska ◽  
Stanisław Mazur
Keyword(s):  
Potato Tuber ◽  
Linear Growth ◽  
Helminthosporium Solani ◽  
Pythium Oligandrum

Abstract The effect of tuber dressing and plant spraying with Biochikol 020 PC (B.A.S. chitosan) and with Polyversum bio-preparation (B.A.S. Pythium oligandrum) on the infestation of stored tubers by Helminthosporium solani was studied. Vitavax 2000 FS (B.A.S. karboxin and thiuram) was used as a standard fungicide. The effect of these preparations applied at three different concentrations on H. solani mycelium linear growth was investigated under in vitro conditions according to the Kowalik and Krechniak method (1961). The application of all tested preparations during potato vegetation resulted in both lower (in comparison to the control) mean infestation degree and lower percent of tubers infected by this pathogen. Results showed that all preparations inhibited H. solani mycelium linear growth.

scholarly journals Effect of light duration on severity of black dot caused by Colletotrichum coccodes on potato

2004 ◽  
Vol 53 (3) ◽  
pp. 288-293 ◽  
Author(s):  
L. Tsror (Lahkim)
Keyword(s):  
Colletotrichum Coccodes ◽  
Black Dot ◽  
Light Duration ◽  
Effect Of Light
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