title: Mode of action of a fatty acid-based natural product to control Botrytis cinerea in grapes.
abstract: OBJECTIVE
  To investigate the efficacy and mode of action of the fatty acid-based product Foodcoat(®) (FC) against Botrytis cinerea.
  
  
  RESULTS
  In vitro, in vivo and field experiments were carried out to investigate the effect of different concentrations of FC on B. cinerea germination and infection of grape leaves and berries, using three selected isolates and comparing results with those achieved by the commercialized product Protector(HML) (PRT). Furthermore, the effect of field applications of FC on the grape berry microbiota was investigated. FC reduced B. cinerea germination and grape berry severity by up to 54 and 96%, respectively, compared with the untreated controls.
  
  
  CONCLUSIONS
  Foodcoat demonstrated efficacy that was equal or greater than the registered product, PRT. A multiple mode of action was hypothesized for FC suppression of B. cinerea, including: inhibition of germination and germ tube alteration, protection of host green tissues and enhancement of the natural yeast populations on the berry surface.
  
  
  CONCLUSIONS
  The efficacy of both products has been quantified and their modes of action described, suggesting them for field applications against B. cinerea, alone or in combined strategies. This is also the first report of a fatty acid-based product stimulating natural yeast populations on grape berries.
authors.affiliation: Food Technology Department, Lleida University, XaRTA-Postharvest, Agrotecnio Center, Lleida, Catalonia, Spain.
authors.forename: C
authors.initials: C
authors.lastname: Calvo-Garrido
authors.forename: P A G
authors.initials: PA
authors.lastname: Elmer
authors.forename: F J
authors.initials: FJ
authors.lastname: Parry
authors.forename: I
authors.initials: I
authors.lastname: Viñas
authors.forename: J
authors.initials: J
authors.lastname: Usall
authors.forename: R
authors.initials: R
authors.lastname: Torres
authors.forename: R H
authors.initials: RH
authors.lastname: Agnew
authors.forename: N
authors.initials: N
authors.lastname: Teixidó
mesh_terms: D001688:Biological Products / Q000737:chemistry / Q000494:pharmacology*; D020171:Botrytis / Q000187:drug effects*; D005227:Fatty Acids / Q000494:pharmacology; D005638:Fruit / Q000382:microbiology*; D064307:Microbiota / Q000187:drug effects; D010935:Plant Diseases / Q000517:prevention & control; D027843:Vitis / Q000382:microbiology*; D015003:Yeasts / Q000187:drug effects
chemical_list: D001688:Biological Products; D005227:Fatty Acids
keywords: Vitis vinifera; adjuvant; estearic acid; lauric acid; palmitic acid; potassium soap