Sensitivity of Venturia inaequalis Populations to Anilinopyrimidine Fungicides and Their Contribution to Scab Management in New York

Plant Disease
Wolfram KöllerD M Parker

Abstract

Sensitivities of Venturia inaequalis isolates to the anilinopyrimidine fungicides (APs) pyrimethanil and cyprodinil were determined for nine populations by measuring the growth of colonies formed from germinating conidia derived from single scab lesions. At the discriminatory pyrimethanil dose of 0.2 μg ml-1, the mean relative growth range measured for eight V. inaequalis populations (n = 39 to 74) never treated with AP fungicides varied from 18.1 to 48.2, translating into an approximately sixfold difference in mean baseline sensitivities. For the composite of all 469 isolates tested, sensitivities to pyrimethanil and to the sterol demethylation inhibitor (DMI) myclobutanil were significantly correlated. When isolates were organized into subpopulations based on their sensitivities to an individual fungicide, sensitivities to both fungicides declined in parallel through the highly and moderately sensitive spectra of subpopulations, but they diverged for isolates in subpopulations least sensitive to either fungicide. The result suggested that at least one of the multiple genes conferring DMI resistance also lowered the sensitivity to AP fungicides. The relative contribution of AP fungicides to scab management was evaluated at an ...Continue Reading

References

May 2, 2000·Toxicological Sciences : an Official Journal of the Society of Toxicology·W F HeydensK J Hotz
Aug 24, 2000·Fungal Genetics and Biology : FG & B·G Del SorboM A De Waard
Dec 11, 2002·Social Science & Medicine·Marc A Musick, John Wilson
Mar 7, 2003·Bioscience, Biotechnology, and Biochemistry·Michiko NakamuraAkira Takatsuki
May 1, 1998·Plant Disease·Urs W Hilber, Maja Hilber-Bodmer

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Citations

Jan 24, 2019·Plant Disease·Mitchell J Bauske, Neil C Gudmestad
Sep 23, 2020·Journal of Molecular Modeling·Jingyu ZhangLiang Wu
Sep 1, 2010·Plant Disease·Maria Lodovica GullinoBrian Sheppard
Nov 18, 2018·Plant Disease·Megan N Biango-DanielsKathie T Hodge

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