engleski

The occurance of olive knot disease caused by Pseudomonas savastanoi in the northwest region of Istrian peninsula

Pseudomonas savastanoi is the causal agent of olive knot disease. This is a bacterial disease that affects olive trees mainly in Mediterranean countries. The bacterium lives as an epiphyte on healthy leaves in nature. When weather conditions are optimal (22-25°C and over 80% relative humidity) it may become a source of infection (Škarica et al, 1996, Civantos López-Villalta, 1999, Lavermicocca et al, 2002). Tissues can be infected through leaf scars (after the leaves fall), wounds and fissures on stem and twigs caused by meteorological phenomena (hail and frost) and insect miners, as well as by harvest and pruning practices. Symptoms are characterized by tumorous outgrowths on different parts of infected plants, mainly shoots and branches. Olive knot disease is considered an important problem for olive crops because of its effect on vegetative growth, olive yield and even possibly on olive oil quality like inferior organoleptic characteristics. Above all, the use of resistant variety is considered one of the most appropriate method of control at this moment, because the peak of the disease depends on variety susceptibility (Civantos López-Villalta, 1999). Some studies have found that different olive genotypes have different degrees of susceptibility to P. savastanoi. Our aim was to quantify the presence of olive knot appearance and set possible reasons which have influenced its presence and spreading.

Olive knot disease ; Istra

nije evidentirano