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Diseases & parasites that attack olive tree. Verticillium wilt affects olive trees in commercial and landscape plantings and many other species. We give a basic description of the disease and the damage it causes and give you a link to the UC Integrated Pest Management (UC IPM) page on the subject for more details and for treatment options and risks. Diseases known as quick decline, leaf scorch, or variegated chlorosis are caused by Xylella fastidiosa, the bacteria best known for causing Pierce’s disease on grapes, but also attacks citrus, peach, almonds, oleander, olives and many other species. Infections usually occur during cooler spring or summer months, and the pathogens are easily spread by water. Olive knot disease on olive, Olea europaea, is distributed in olive-growing regions worldwide, and reports of the disease in California date back to the late 19th century.The disease is caused by Pseudomonas savastanoi pv.savastanoi (Psv), a bacterial pathogen that is spread short distances during the winter and spring rain events associated with California's Mediterranean climate. This olive tree disease typically defoliates and kills the affected foliage. Factors such as location and weather will play a part in which issues your tree encounters. The olive tree resists diseases very well, and they rarely are fatal. This disease causes leaves to turn brown. Keeping olive trees well-fed and adequately watered is the best initial defence against pests and diseases, since vigorous trees are better able to withstand attack and less likely to suffer long-term damage. In California, verticillium, a fungus disease that … Every tree has the future potential for disease and insect damage. Southern Europe Could Lose $22 Billion Fighting Deadly Olive Tree Disease The tree killer is a bacterium called xylella fastidiosa. Pests & Diseases of Olive Trees The olive tree is affected by some pests and diseases, although it has fewer problems than most fruit trees. Disease Infection. The French agriculture ministry announced the discovery of … Around the Mediterranean Sea the major pests is the medfly, the olive fruit fly [Dacus oleae]. Further afield, even more groves show the tell-tale signs: dying leaves and branches. Olive Agriculture: Pest Management Guidelines University of California's official guidelines for pest monitoring techniques, pesticides, and nonpesticide alternatives for managing pests in agriculture. Galls up to 2 inches in diameter appear on the tree. Once pests are identified, ask garden centre staff to recommend suitable control products. Olive knot is a bacterial disease that is spread by water and enters the tree through pruning cuts, cracks or wounds on the tree. (Photo by Cain Burdeau) Along the high­way, tow­er­ing olive trees are cov­ered in brown brit­tle leaves. Here is some basic information about how to identify various diseases affecting olive trees. A deadly disease estimated to have killed a million olive trees in Italy has spread to France.. Olive tree near Oria, in the area of Salento in Puglia, that has been felled due to an outbreak of Xylella fastidiosa. Pest & Disease Control for Olive Trees. For growing olive trees in pots, choose the ‘Amygdalolia’ variety, which naturally grows to smaller sizes. Bacterial leaf scorch (BLS) is an infectious disease caused by the Xylella fastidiosa bacterium. Nonetheless, some parasites are common and it is worth treating them so as to not weaken the olive tree. 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