A Two-Phase Resistance Response of Venturia inaequalis Populations to the QoI Fungicides Kresoxim-Methyl and Trifloxystrobin

Plant Disease
W KöllerKeith Cronshaw

Abstract

The class of fungicides acting as respiration inhibitors by binding to the Qo center of cyto-chrome b (QoIs) are in wide use for the management of apple scab caused by Venturia inaequalis. In order to assess responses of V. inaequalis populations to treatments with QoIs, sensitivities of isolates were determined for germinating conidia or for mycelial colonies developing from germinating conidia. Under both test conditions, inhibitory potencies of kresoxim-methyl and trifloxystrobin were largely equivalent. V. inaequalis populations treated with QoIs in a commercial and an experimental orchard both responded with significant shifts toward declining QoI sensitivities. However, the population responses were quantitative in nature, and highly resistant isolates indicative of a cytochrome b target site mutation were not detected. V. inaequalis populations from both orchards investigated also were fully resistant to sterol de-methylation-inhibiting fungicides (DMIs) such as fenarimol and myclobutanil, but isolate sensitivities to QoIs and DMIs were largely unrelated. Performance tests with kresoxim-methyl and trifloxystrobin at the experimental orchard diagnosed as DMI-resistant revealed that the quantitative shift toward declining ...Continue Reading

References

Jan 1, 1986·Methods in Enzymology·G von Jagow, T A Link
Mar 14, 2001·Biochimica Et Biophysica Acta·T Joseph-HorneP M Wood
Apr 27, 2002·Pest Management Science·Ruth B Küng FärberNeil Leadbitter
May 31, 2002·Molecular Plant-microbe Interactions : MPMI·Cruz Avila-Adame, Wolfram Köller
Jul 31, 2002·Pest Management Science·Dave W BartlettBob Parr-Dobrzanski
Sep 18, 2002·Pest Management Science·Ulrich GisiAlan McCaffery
May 17, 1999·Angewandte Chemie·Hubert SauterTimm Anke

❮ Previous
Next ❯

Citations

Mar 1, 2009·Plant Disease·Sarah J PethybridgeForrest W Nutter
Jan 5, 2011·Molecular Plant Pathology·Joanna K BowenMatthew D Templeton
Jan 24, 2019·Plant Disease·Chelsi P Abbott, Janna L Beckerman
Jun 30, 2018·Annual Review of Phytopathology·N J Hawkins, B A Fraaije

❮ Previous
Next ❯

Related Concepts

Related Feeds

Antifungals

An antifungal, also known as an antimycotic medication, is a pharmaceutical fungicide or fungistatic used to treat and prevent mycosis such as athlete's foot, ringworm, candidiasis, cryptococcal meningitis, and others. Discover the latest research on antifungals here.