Guidelines for evaluating disease resistance in potato cultivars. Foliage blight resistance (field test)Phytophthora infestans (Mont.) de Bary

Dowley, L. J.; Carnegie, S. F.; Balandras-Chatot, C.; Ellissèche, Daniel; Gans, P. T.; Schöber-Butin, Bärbel; Wustman, R.

doi:10.1007/bf02358397

Cited by 10 publications

(11 citation statements)

References 2 publications

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“…The level of resistance in the foliage and tubers was determined by 3 or more years of testing at the Department of Plant and Environmental Sciences (Bjor, 1987, 1989). The foliar resistance test was in close accordance with the European Association for Potato Research guidelines for foliar‐blight‐resistance field tests (Dowley et al. , 1999).…”

Section: Methodsmentioning

confidence: 89%

Exploiting host resistance to reduce the use of fungicides to control potato late blight

2006

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Field trials in 1996, 1997 and 1998 with six potato cultivars differing in levels of foliar and tuber race-nonspecific resistance to late blight were treated with 100, 50 and 33% of the recommended dose of the fungicide fluazinam at application intervals of 7, 14 and 21 days. Using a mixed inoculum of six or seven indigenous isolates of Phytophthora infestans small potato plots were inoculated via infector plants. A foliar blight model for the relationship between the effects of resistance, fungicide application and disease pressure was developed using multiple regression analysis. Cultivars with a high level of quantitative resistance offered the greatest potential for fungicide reduction. The model showed that the effect of resistance on integrated control increased exponentially with increasing cultivar resistance. Reducing fungicide input by lowering the dose resulted in less foliar disease than extending application intervals. The higher the disease pressure, the greater the risk associated with reducing fungicide input by extension of application intervals. The field resistance of cultivars to tuber blight mainly determined the frequency of tuber infection. Exploiting high foliar resistance to reduce fungicide input carried a high risk when cultivar resistance to tuber blight was low. When field resistance to tuber blight was high, a medium level of resistance in the foliage could be exploited to reduce fungicide dose to c . 50%, provided application was at the right time. At a high level of field resistance to both foliar and tuber blight, application intervals could be extended.

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Section: Methodsmentioning

confidence: 89%

Exploiting host resistance to reduce the use of fungicides to control potato late blight

2006

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“…Information about resistance to late blight is available from official national potato cultivar lists, and in the European Cultivated Potato Database (http://www.europotato.org) as 1–9 scale values where 1 = most susceptible. The scale values are, in most cases, generated from area under the disease progress curve (AUDPC) values obtained in foliage blight field tests (Dowley et al ., 1999; Zimnoch‐Guzowska & Flis, 2002). To the authors’ knowledge, the transformation of AUDPC values into scale values is often based on an empirical comparison of results from the cultivars being tested with those of standard cultivars, which have been assigned scale values.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of foliar resistance in potato to Phytophthora infestans based on an international field trial network

et al. 2005

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During the period 2000-03, local potato cultivars in Estonia, Latvia, Lithuania, Poland and Denmark were tested for foliar resistance to Phytophthora infestans (late blight) in an international field trial network. Four standard cultivars were included in the trials: Sava, Oleva, Danva and Kuras. Primary disease-assessment data were entered into a common database, and parameters from the disease progress curves were calculated and made available on interactive web pages. A regression model, using relative area under disease progress curve (RAUDPC) values for cv. Oleva as a reference, was developed for the estimation of 1-9 scale values, where 1 = most susceptible. Standard deviations for the estimated 1-9 scale values and a nonparametric rank stability analysis of RAUDPC were used to evaluate the stability of resistance of the cultivars. Overall, the results showed stability of resistance for cvs Sava, Oleva and Danva, but not for Kuras. Use of the Internet-based Web-Blight service in this study facilitated comparison of results among countries for the level and stability of resistance. The estimated 1-9 scale values were similar to, or slightly lower than, those from official cultivar lists or from the European Cultivated Potato Database, especially for the more resistant cultivars. Possible reasons for discrepancies from different sources and locations are discussed. It is concluded that RAUPDC and the derived 1-9 scale values are useful for ranking cultivars for resistance to P. infestans , but this information is not detailed enough for use in a decision support system for late blight control.

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“…Consequently the necessity for cooperation in establishing protocols and implementing these on an international scale is evident. Some work has been initiated (Dowley et al, 1999) more has to be done. The EAPR Working Group on Varietal Assessment should play an important role in this effort aiming at EC common regulations.…”

Section: Resultsmentioning

confidence: 99%

“…Standard methodologies for the controlled inoculation of new cultivars with known pathogens are preferable to ensure repeatable and consistent results. A working group within the EAPR Pathology Section has recently formulated an agreed methodology for assessing the resistance of cultivars to foliage late blight in the field (Dowley et al, 1999). Similar standardisation of methodologies for testing for other diseases has been initiated within the EAPR Working Group on Varietal Assessment (Breeding section).…”

Section: Resultsmentioning

confidence: 99%

Assessment of new potato cultivars in Europe: a survey

Wustman¹,

Carnegie

2000

Potato Res

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SummaryIn 1994, a postal questionnaire was sent to 41 institutes in 27 countries to obtain information on the national potato cultivar testing programmes in Europe. Responses were received from 19 countries.Foliage, tuber and yield characteristics were assessed in all countries but the number of sites and replicates varied considerably between the countries. Cooking and taste qualities were measured in most countries using relatively simple methods but processing characteristics were tested less commonly. Susceptibility to the most common diseases, i.e. late blight, common scab, leafroll and PVY ~ was assessed in over 75% of the countries while resistance to another 21 diseases and 4 potato cyst nematode pathotypes was assessed by various countries, depending on their national importance. Many of the assessments were based on records of natural infection although controlled inoculation tests were done more frequently for the more important diseases.

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Guidelines for evaluating disease resistance in potato cultivars. Foliage blight resistance (field test)Phytophthora infestans (Mont.) de Bary

Cited by 10 publications

References 2 publications

Exploiting host resistance to reduce the use of fungicides to control potato late blight

Exploiting host resistance to reduce the use of fungicides to control potato late blight

Evaluation of foliar resistance in potato to Phytophthora infestans based on an international field trial network

Assessment of new potato cultivars in Europe: a survey

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