Olive Tree Disease California

Armillaria root rot also referred to as oak root fungus armillaria mellea is generally not a serious disease of olive trees in california although it occasionally attacks olives and can sometimes eventually kill trees. The olive tree is susceptible to verticillium wilt olive knot diplodia canker leaf spot and fruit mummification. The coastal valleys of california provide this type of environment.

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Wilt olive tree verticillium dahliae the verticillium verticilosis or wilt olive tree is a disease caused by a soil fungus its treatment being very difficult.

Olive tree disease california. Olive tree xylella disease is feared by olive growers around the world. It is more prevalent following wet winters. It is caused by a soil borne fungus. During a recent meeting of the olive oil commission of california several board members reported evidence of a new disease that appears to be affecting california olive trees.

Olive trees are evergreens that when mature will reach a height of 50 feet and a width of 30 feet. Xylella fastidiosa xf is a xylem limited bacterium that causes a number of diseases in economically important crops in california and worldwide. So far there is no cure for olive quick decline although controlling sap sucking insects and rapid removal of infected plants may help slow the spread. Around the mediterranean sea the major pests is the medfly the olive fruit fly dacus oleae.

Scorching symptoms in olive trees potentially caused by xf infection have emerged as a potential disease threat to olive production areas in california. Control of weeds and careful mowing of grasses can limit plants that host sap sucking insects. The olive tree is affected by some pests and diseases although it has fewer problems than most fruit trees. Posted here are pictures by university of california plant pathologist florent trouillas which illustrate symptoms in twigs and leaves from infected orchards that may help you determine if this problem occurs in your olive orchards.

In california verticillium a fungus disease that causes wilting and death is a serious fungal disease. Pests diseases of olive trees. At present the use of varieties or resistant rootstocks is necessary to replant infected olive tree groves.