A time-course investigation of resistance to the carboxylic acid amide mandipropamid in field populations of Plasmopara viticola treated with anti-resistance strategies

Pest Management Science
Silvia L ToffolattiHelge Sierotzki

Abstract

Despite anti-resistance strategies being recommended to reduce selection pressure on insensitive strains, no information is available on fungal population dynamics following their application in real field conditions. In this study, the effects on Plasmopara viticola populations of two identical spray programs, differing only in including or not the carboxylic acid amide (CAA) mandipropamid in mixture and in alternation with an anti-resistance partner, were compared in terms of downy mildew control efficacy and mandipropamid sensitivity in two commercial vineyards for four seasons. Both programs effectively and similarly protected grapevine from downy mildew, despite different starting sensitivity levels of the P. viticola populations. In the vineyard where resistant strains were initially present, the frequency of mutations associated with resistance (G1105S/V) fluctuated within seasons in both programs and a shift towards sensitivity occurred after 3 years of the mandipropamid-free program. Where sensitivity was initially present, no changes occurred in the mandipropamid-free program and resistant strains were selected in the mandipropamid program in high disease pressure conditions. The anti-resistance strategy including man...Continue Reading

References

Feb 8, 2006·Molecular Aspects of Medicine·Mikael KubistaNeven Zoric
Dec 5, 2006·Pest Management Science·Silvia L ToffolattiAnnamaria Vercesi
Aug 6, 2008·Annual Review of Phytopathology·Frank van den Bosch, Christopher A Gilligan
Sep 23, 2009·Pest Management Science·Derek W Hollomon, Keith J Brent
Aug 18, 2012·PloS One·Matthew D Castle, Christopher A Gilligan
Mar 25, 2014·PloS One·Peter H F HobbelenFrank van den Bosch
Sep 13, 2014·Pest Management Science·Silvia L ToffolattiAnnamaria Vercesi
Jun 11, 2015·The Plant Pathology Journal·Geun-Hye GangYoun-Sig Kwak

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Citations

Aug 28, 2020·Frontiers in Plant Science·Melissa Si AmmourVittorio Rossi
Nov 10, 2020·Frontiers in Plant Science·Maryam SargolzaeiGabriella De Lorenzis

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