Sensitivity of California Isolates of Uncinula necator to Trifloxystrobin and Spiroxamine, and Update on Triadimefon Sensitivity

Plant Disease
T C Miller, W D Gubler

Abstract

Sensitivities of Uncinula necator to spiroxamine and trifloxystrobin were established by assay of 36 and 35 isolates, respectively, recovered from California grape vineyards in 2002 and increased as single-spore lines for laboratory testing. Twenty-nine single-spore isolates also were evaluated for levels of sensitivity to the fungicide triadimefon to determine if there had been a reversion to sensitivity following the development of resistance in 1986. Although triadimefon use was limited after 1992, other demethylation inhibitor (DMI) fungicides (fenarimol and myclobutanil) were used extensively in California vineyards. For spiroxamine, the sample mean value of the median effective concentration (EC50 value) was 365 μg/liter (95% confidence interval [CI] from 251 to 531 μg/liter) and values were distributed log-normally. The corresponding mean for trifloxystrobin was 12.8 μg/liter bounded by 8.9 to 18.5 μg/liter for the 95% CI. State-wide, the triadimefon mean EC50 was 8.8 mg/liter, bounded by a 5.3 to 14.5 mg/liter 95% CI, and those values were significantly higher than those obtained in the last assay 12 years earlier. Significant differences in sensitivity of U. necator to triadimefon were detected at a regional scale by c...Continue Reading

References

Jul 1, 1977·The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society·I T Young
May 23, 1998·Current Genetics·A J EngelsM A De Waard
Apr 27, 2002·Pest Management Science·Ruth B Küng FärberNeil Leadbitter
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Sep 18, 2002·Pest Management Science·Ulrich GisiAlan McCaffery
Sep 18, 2002·Pest Management Science·Pierre LerouxFlorence Chapeland

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Citations

Sep 23, 2020·Microorganisms·Alejandra Vielba-FernándezDolores Fernández-Ortuño
Jan 1, 2012·Plant Disease·Jeneylyne F ColcolAnton B Baudoin
Dec 8, 2007·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Sarolta HoffmannPál Kozma

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