Wednesday, August 27, 2014

Impersonating an Insect

Usually when a gardener tells me there are holes in the leaves of their plant, I assume insect damage.
However, that is not always the case. Leaves that have been affected with shot hole disease often appear as having been chewed by an insect.  Plants in the Prunus genus such as almond, apricot, cherry, cherry-laurel, peach and plum are candidates for this problem.  Shot hole disease can be caused by a fungus or a bacteria, so treatment will depend on which type you have.  It gets the name from the multiple holes in the leaves, which have a shotgun hole appearance. The symptoms start with leaf spots which eventually dry up and fall off the leaves leaving the holes. Infected leaves can also turn yellow and fall off the tree prematurely.  The disease is usually more of a problem after a wet spring.
shot hole disease on cherry laurel

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