Biologija, simptomatologija i mjere suzbijanja bakterioznog odumiranja trešnje na području Umaga

In recent production seasons there have been frequent reports of the occurrence of slimy resin and drying of shoots, branches and whole cherry trees, and bacterial dieback was suspected. The known pathological agents causing disease suspected are bacterial species of Pseudomonas syringae pv. syringae and Pseudomonas syringae pv. morsprunorum. The bacterium Pseudomonas syringae pv. morsprunorum during the winter period causes cancers and wounds, while in the spring causes necrotic leafspots. During Pseudomonas syringae pv. syringae symptoms usually occur in the form of elliptic or round leafspots, often in black, dark brown or dark reddish color. In this paper, the isolation of bacteria from the symptomatic tissue of the symptomatic cherry sprigs was performed. Two different bacterial isolates were obtained. Each isolate was tested for Gram reaction and for the production of fluorescen pigment. The pathogenicity of the two isolates was determined by hypersensitivity reaction on tobacco (Nicotiana tabacum var. Samsun). The control of bacterial diseases caused by these bacteria is based on preventive agrotechnical and chemical measures.