Controlling of fire blight on popular apple cultivars with M9 rootstock
K. BASTAS (1)
(1) Selcuk University Faculty of Agriculture, Konya, TURKEY
Phytopathology 100:S12

The shoot blight phase of fire blight caused by Erwinia amylovora is highly destructive within the current and subsequent growing seasons. This study gives an assessment of the effect of different preparats, harpin protein (Hp), gamma aminobutryric acid+L-glutamic acid (ABA), copper oxychloride, copper sulphate pentahydrate, phosphoroz acid, Ca-nitrate, foshetyl-Al, prohexadione-Ca (PC), Bacillus subtilis, B. subtilis+coralline (Bsc), potassium+sulphur (KS) on shoot growth and fire blight disease on 10 years old apple trees, Fuji, Breauburn, Royal Gala, Golden Delicious grafted on M9 rootstock in 2008 and 2009 years. Whilst PC treatments early in the season considerably decreased the length of shoots, Hp, Bsc, ABA, KS treatments caused increasing of shoot growth. Disease incidence in apple trees treated with PC, Hp and inoculated was about 18%, markedly contrasting with 62% in the untreated plants. The use of resistance-inducing substances during the early phase of shoot growth may offer a means of managing the shoot blight of fire blight disease on apples.