Olive trees are native to the Mediterranean , tropical and cardinal Asia and piece of Africa . There are several thing necessitate to successfully grow an olive tree : a long , blistering farm season , a frost - free environs and a wintertime shivering to set the fruit . The coastal vale of California provide this type of surroundings . Olive trees are evergreen plant that , when mature , will reach out a height of 50 feet and a breadth of 30 foot . The olive tree is susceptible to verticillium wilt disease , olive knot , diplodia canker , leaf spot and fruit mumification necrosis .

Verticillium Wilt

The fungus verticillium dahliae is responsible for verticillium wilt . The fungus survives in the soil and in the roots of an infected tree . The disease can be spread when the stain is till , by water irrigation and by pruning tools that have not been disinfect after lop a diseased plant life . When an olive tree has verticillium wilt , the leaves on one or several branch will droop and stick around to the outgrowth . This wilting will take place during the produce time of year and will progress to other branches . Verticillium wilt can pop a tree diagram . There is no known method of ascendancy . The only way of life to manage verticillium wilt disease is to forefend planting an olive tree in an septic internet site .

Olive Knot

Olive air mile is a bacterial disease have by pseudomonas syringae pv savastanoi . It is generally found on primary and secondary branch . star sign of European olive tree international nautical mile are freshness / naut mi that are ½ inch to 2 in in diam . The bacteria enter through a wound or opening in the tree . Olive knot disrupt the water and sugar supply to the tree ; when this happen it causes defoliation and dead branches . The bacterium are present in the olive mile , and this bacterial disease distribute by watering and rainwater . The treatment is preventative . antibacterial drug that contain copper are apply to wounds – this will derogate the disease . The antibacterial drug should be applied in the gloaming and spring , but never before harvest . Pruning should be done in the months of July through August ( the ironic season ) .

Diplodia Canker

Diplodiae fungus is what get diplodia canker . The tree , however , is not straightaway affected by this fungus . The fungus is known to exacerbate olive knot disease . Diplodiae fungus enters the galls form from Olea europaea knot and then introduce the tree diagram and organize a canker . These cankers kill small-scale shoot as well as leg . There is no way to control diplodia canker .

Leaf Spot

folio spot is also know as peacock spot , olive leafage smear and shuttle ’s eye spot . This disease is induce by spilocaea oleaginea , a fungus . Dark green to dark round spots appear on the leaves . A yellow ring may sometimes appear around the spot . The result of leaf spot are defoliation and , depending upon the asperity of the disease , rosiness nonstarter as well as a reduced crop of olives . Trees should be treat with a protective fungicide such as Bordeaux mixture . The antimycotic can be applied in other fall or other spring . Cultivars that are passing susceptible to leafage maculation let in Manzanilla , Frantoio , Arbequina and Moroccan Picholine .

Fruit Mummification

Gleosporium olivarum is the fungus that causes fruit mumification necrosis . The fungus penetrates the skin of the olive , chocolate-brown round place formulate and get expectant as the disease progresses . Fruit mummification is found for the most part in Portugal , Greece and Lebanon . Management of the disease is through applying a prophylactic fungicide in early September , prior to the rainy season .

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