engleski

The Occurrence of Olive Knot Disease Caused by Pseudomonas savastanoi in the Northwest Region of Istrian Peninsula

Olive knot, a disease caused by pathogen bacteria Pseudomonas savastanoi is known from the ancient Roman times. Nowadays it is spread in almost all olive production areas and represents the main disease in olive groves. The bacteria stimulates tissue proliferation and abnormal cell division from which tumour formations are formed. With disease development, tumours grow and their number increase which can lead to branch and shoots decline and lower yields. The oil from olives on contaminated olive trees has lower quality. The bacteria penetrates the olive through open wounds from cutting or harvesting as well as through wound caused by hail and strong winds. Considering the incidence of disease occurrence in surroundings of Poreč (northwest Istria, Croatia) during the 2008 our aim was to quantify the presence of olive knot appearance and set possible reasons which have influenced its presence and spreading. The researched area had 140 ha of olive trees in which there were 5 separate research locations with similar ecological and microclimatic circumstances planted with Leccino and Picholine varieties. Frequency and degree of contamination were defined by visual examination of olive’ s upper parts, and results were shown numerically (on scale). Intensity infestation of olive knot was different on various locations. Variety Leccino showed less susceptibility to infection of bacteria compared to Picholine. Gained results can be used in strategies for decreasing damages caused by this disease.

Croatia ; monitoring ; olive knot ; olive tree ; Pseudomonas savastanoi

nije evidentirano