Resistance of potato cultivars to Synchytrium endobioticum in field and laboratory tests, risk of secondary infection, and implications for phytosanitary regulations

R.P. Baayen*, H. Bonthuis, J.C.M. Withagen, J.G.N. Wander, J.L. Lamers, J.P. Meffert, G. Cochius, G.C.M. Van Leeuwen, H. Hendriks, B.G.J. Heerink, P.H.J.F. Van Den Boogert, P. Van De Griend, R.A. Bosch

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

13 Citations (Scopus)

Abstract

Laboratory (Spieckermann) tests, pot tests and field tests provided concordant evidence for the partial nature of resistance of potatoes to pathotypes 1 (D1) and 6 (O1) of Synchytrium endobioticum. Susceptible potato cultivars produced large warts (> 16 mm in diameter) in Spieckermann tests and had low field resistance levels (1-6). Field-resistant cultivars (levels 7-9) produced small warts or no warts at all in Spieckermann and field tests. In pot tests, at low inoculum levels (1 sporangium per 25 g soil) susceptible cultivars still developed warts, whereas field-resistant ones did not develop any warts below 25 sporangia per g soil. Above 35 sporangia per g soil, 100% disease incidence was observed in susceptible cultivars but only minimal wart development in field-resistant ones. Tests with continuous cultivation of potato cultivars in infected soil during three consecutive years showed that field-resistant cultivars will not support build-up of inoculum in soil. It is concluded that field-resistant cultivars do not create a risk of secondary infection, the criterion given for resistance in EU Directive 69/464/EC.

Original languageEnglish
Pages (from-to)9-23
Number of pages15
JournalEPPO Bulletin
Volume35
Issue number1
DOIs
Publication statusPublished - Apr 2005

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