Abstract
The aim of this study was to investigate the possibilities for reducing fungicide treatments of sour cherry. The study was conducted in fruit bearing sour cherry orchards of the Institute of Agriculture at Kyustendil during 1991-2005. Cherry leaf spot was controlled by postinfection applications of ergosterol biosynthesis inhibitors and dodine. Bacterial canker, brown rot, shot-hole syndrome were controlled by protective treatments with copper-containing fungicides in late autumn and early spring. Insecticide treatments were applied when it was necessary. Blumeriella jaapii is the main pathogen of sour cherry which can be controlled successfully by postinfection treatments. Their number could be reduced in some years. Sprays against leaf spot were effective against other diseases too. Protective treatments against Pseudomonas syringae with copper-containing fungicides were effective against shot-hole syndrome and Monilinia laxa as well as Monilinia fructigena.
Highlights
The soil, climatic and topographical conditions in some regions of Bulgaria are favourable for sweet and sour cherry growing and production of high quality fruits
A lot of fungi attack sour cherry but cherry leaf spot caused by Blumeriella jaapii (Eisensmith and Jones, 1981a, b; VelichkovaSotiriva, 1983; Borovinova, 1998) and blossom and twig blight caused by Monilinia laxa (Borovinova and Sredkov, 2003; Holb, 2003, 2004; Holb and Schnabel, 2005) are the most important fungal diseases
The aim of this study was to investigate the possibilities for reducing fungicide treatments of sour cherry with postinfection treatments for control of cherry leaf spot and with using of appropriate fungicides
Summary
The soil, climatic and topographical conditions in some regions of Bulgaria are favourable for sweet and sour cherry growing and production of high quality fruits. The area of sour cherry orchards in Bulgaria was 4000 ha in 1990, but during the period of transition the area planted with sour cherry trees has decreased and reached 1540 ha in 2004. A lot of fungi attack sour cherry but cherry leaf spot caused by Blumeriella jaapii (Eisensmith and Jones, 1981a, b; VelichkovaSotiriva, 1983; Borovinova, 1998) and blossom and twig blight caused by Monilinia laxa (Borovinova and Sredkov, 2003; Holb, 2003, 2004; Holb and Schnabel, 2005) are the most important fungal diseases. During ripening of sour cherry, fruits can be attacked by Monilinia fructigena, Monilinia laxa, Botrytis cinerea and Alternaria spp., which cause rot
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