title: Reduction in bacterial ooze formation on immature fruitlets after preventive treatments of Fosethyl-Al against fire blight Erwinia amylovora.
abstract: Fire blight, caused by the bacterium Erwinia amylovora (Burill Winslow et al.), is a very important bacterial disease on apple and pear orchards with devastating effects in some production area and in some years. Fire blight control consists in a whole strategy of measures that should start with control measures in and around the fruit tree nurseries. Only the use of Vacciplant (Laminarin), an inducer of the self-defence mechanism, is registered in Belgium since 2009. In other European countries Fosethyl-Al has been registered for fire blight control. Recently, research trials have been done at Pcfruit research station for several years on the activity of ALiette (fosethyl-Al) against fire blight. Fosethyl-Al, also a plant defence enhancing molecule, applied preventively 3 times at a dose of 3.75 kg/ha standard orchard (3 x 3000 g a.i./ha standard orchard), showed a reduction in the host susceptibility and decreased the disease development on artificial inoculated flower clusters and shoots. Also a clear reduction in the ooze droplet formation on artificially inoculated immature fruitlets has been observed with this molecule. This reduction in the bacterial ooze formation is considered as a very important factor in the spread of the disease in the orchard.
authors.affiliation: PCFruit Research Station, Fruittuinweg 1, BE-3800 St-Truiden, Belgium.
authors.forename: T
authors.initials: T
authors.lastname: Deckers
authors.forename: H
authors.initials: H
authors.lastname: Schoofs
authors.forename: W
authors.initials: W
authors.lastname: Verjans
authors.forename: L
authors.initials: L
authors.lastname: De Maeyer
mesh_terms: D000383:Agriculture / Q000379:methods*; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D044084:Erwinia amylovora / Q000187:drug effects*; D005638:Fruit / Q000382:microbiology; D027845:Malus / Q000382:microbiology; D009943:Organophosphorus Compounds / Q000494:pharmacology*; D010935:Plant Diseases / Q000382:microbiology / Q000517:prevention & control*; D031989:Pyrus / Q000382:microbiology
chemical_list: D000900:Anti-Bacterial Agents; D009943:Organophosphorus Compounds; C053504:fosetyl-Al