A time-course investigation of resistance to the carboxylic acid amide mandipropamid in field populations of Plasmopara viticola treated with anti-resistance strategies
Articolo
Data di Pubblicazione:
2018
Citazione:
A time-course investigation of resistance to the carboxylic acid amide mandipropamid in field populations of Plasmopara viticola treated with anti-resistance strategies / S.L. Toffolatti, G. Russo, P. Campia, P.A. Bianco, P. Borsa, M. Coatti, S.F. Torriani, H. Sierotzki. - In: PEST MANAGEMENT SCIENCE. - ISSN 1526-498X. - 74:12(2018 Dec), pp. 2822-2834.
Abstract:
BACKGROUND: 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.
RESULTS: 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 strainswere selected in the mandipropamid programin high disease pressure conditions.
CONCLUSION: The anti-resistance strategy including mandipropamid in mixture showed a good field performance, but did
not completely prevent an increase in the frequency of insensitive strains. This supports the need for appropriate planning to
determine which mixtures should be used in the field.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
grapevine; downy mildew; Oomycete; disease severity; disease management
Elenco autori:
S.L. Toffolatti, G. Russo, P. Campia, P.A. Bianco, P. Borsa, M. Coatti, S.F. Torriani, H. Sierotzki
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