Fireblight of pome fruit trees in Turkey: distribution of the disease, chemical control of blossom infections and susceptibility of some cultivars.
In 1985, fireblight of pome fruit trees was first recorded in Turkey in pear orchards in central and western parts of Anatolia. The disease is currently distributed in most of the pear, quince and apple growing regions of Turkey. Infection was also observed on some Pyrus spp, Eriobotrya japonica, Pyracantha spp., Crataegus spp. and Mespilus germania. Thirty-two isolates of Erwinia amylovora from different hosts and different locations were obtained. It was determined that these isolates had the same morphological and physiological characters as strain NCPPB 595 used in experiments as a reference culture. Levels of sensitivity of these isolates were tested in vitro against streptomycin sulfate and Minimum Inhibition Concentrations (MIC) were 2-10 µg/ml. Fosetyl (as Aliette), cuprammonium (as Copac E), streptomycin (as Agrimicina) and copper oxychloride (as Cuprovit) were tested to control blossom infections under orchard conditions. High dose sprays reduced the number of infections on pear blossoms. The reactions to fireblight of 15 apple, 23 pear and 6 quince cultivars widely grown in Turkey were investigated. This paper was presented at the Sixth International Workshop on Fire Blight, held in Athens, Greece, 20-23 Oct. 1992.