2015•Archivio istituzionale della ricerca (Alma Mater Studiorum Università di Bologna)Requires access
New findings about the sensitivity of Plasmopara viticola to CAA fungicides
Irene Maja Nanni, A. Pirondi, Daniela Mancini, A. Brunelli, M. Collina
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Abstract
Carboxylic Acid Amides (CAA) are widely used to control grapevine downy mildew (Plasmopara viticola) worldwide. Dimethomorph, the first CAA fungicide (Albert et al., 1988), has been authorized in Italy since 1994. Other CAA compounds as iprovalicarb, benthiavalicarb, valifenalate have been in use since the early 2000s, while mandipropamid was introduced in 2009. In 2010 the single point mutation leading to an amino acid exchange from glycine to serine at codon 1105 (G1105S) in the CesA3 protein was discovered, conferring CAA resistance in P. viticola (Blum et al, 2010). During the last years, resistance has increased gradually in Europe although field performances has been good (FRAC). \nA wide monitoring work has been carrying out to evaluate the sensitivity of Italian P. viticola populations to CAA fungicides. In this text some results obtained in biological assays conducted towards mandipropamid and dimethomorph.will be reported. ..............................................