How to Identify, Prevent and Treat Gummosis on Fruit Trees Leucostoma persoonii and Leucostoma cincta
Gummosis refers to the oozing of sap or gum from a tree. This behavior is very common on stone fruits, including apricots, peaches, and plums.
You can look at gummosis as your tree’s cry for help in the face of any one of a number of problems.
The most common cause of gummosis is a fungus originally called Cytospora that is now calledLeucostoma.
This fungus is opportunistic. That means that it infects easy targets like weakened trees. It requires both a wound and a tree that is stressed.
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Pruning cuts are a major source of entry for this fungus. Sunscald and cold injury – and even deer rubs – can make your tree vulnerable to Cytospora infection.
Prevention is the best way to manage this condition.
Two Leucostoma Species Infect Fruit Trees
Two species of Leucostoma can be on the attack. L. persoonii is more likely to infect apricots, plums, peaches, nectarines and cherries grown at a low elevation. This species is more of a problem in warmer climates.
In contrast, L. cincta is more likely to attack apples and cherries in cooler areas, like orchards at high elevations.
Both species of fungus are widespread in the US and throughout British Columbia and Ontario, Canada as well. They have also been known to cause problems in South America, Europe, and Japan.
How to Diagnose Gummosis Due to Leucostoma Canker
Your tree will exhibit symptoms like dieback of the canopy and tree flagging. And it will produce a lot of gum. Think excessive.
The gum that Leucostoma fungi produce has a dark amber color. Scrape off the bark and look at
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