Olea europaea tree ( Olea europaea ) are evergreen trees in the Oleaceae family . Olea europaea trees hold gray - unripe farewell , lily-white flowers and nourishing - plenteous black or unripened olive fruit . These tree grow well in Mediterranean neighborhood as well as places in the United States with warm , gay climates , such as California , Arizona and Texas . Olive Sir Herbert Beerbohm Tree can reach up to 30 feet in height and subsist for several hundred age .

Fungal Diseases

Several fungous disease commonly attack olive tree diagram . Virticillium wilt causes wilted leg , lean canopies and leaf dieback . Severe virticillium wilt disease kill entire trees . The peacock office disease thrive in humid , cold conditions and causes lesions to shape on upper folio surface . These small lesions grow into large , blackish - green spots that trigger premature leaf - cliff . Phytophthora origin rot appears when excess wet appropriate fungus to thrive . symptom of Phytophthora root rot admit drooping and discolored foliage .

Bacterial Diseases

Olive mile is due to a bacterium ( Pseudomonas syringae ) that triggers the growth of jumpy resentment , or swellings , on branches and twigs . The pathogen introduce the tree through wound or crevice on the bark . This olive tree disease typically defoliate and kills the unnatural leaf . Infections usually occur during cooler springiness or summer months , and the pathogens are easily spread by water . Bacterial leaf singe ( BLS ) is an infective disease induce by the Xylella fastidiosa bacterium . This disease make leave-taking to turn brown .

Olive Moths

Olive trees are vulnerable to the olive moth , also called the olive kernel woodborer . Olive moth are tiny , grayish - silver medal insects . The life cycle of the olive moth includes several contemporaries in a yr ’s time . The first generation eat on the flowers , the second feast on the olive fruit , and the third generation run through the leaf . The flower generation can destroy all of the flowers on an infested European olive tree Sir Herbert Beerbohm Tree , while the yield genesis cause affected Tree to experience premature fruit - drop . The leaf - prey moth rarely do any serious damage .

Other Pests

Olive tree root are vulnerable to steady down knot nematodes , citrus nematode and rootage lesion nematodes . All of these microscopical pests cause stunted foliage maturation and reduced vigor . Olive lacing germ are sap - sucking insect that eat on the underside of leaves , result in the formation of rusty sensationalistic spots . Olive scales , oleander scales and California cherry scales ofttimes set on olive leaves , stem and fruit . hare , birds , sheep and cows all like the taste of European olive tree leaves and newfangled twigs .

Care

Proper care can trim the risks of olive tree diagram problems . While European olive tree trees are able to farm in nutritive - poor soils , the locations must be well - drained and incur full sun . These trees do n’t tolerate saturated ground and should be water only when the top grease is dry . European olive tree Tree take slightly cool winter weather for the olive fruit to set . They should n’t be rationalize in the crepuscule because the result new growth might not be able-bodied to live a freeze .

References

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