By The Old House Web


Bacterial leaf spot and stem canker begins as light green, water soaked spots. These later turn brown or black with reddish margins. The leaf stalks become black and shriveled. A black decay extends from the tips of the twigs downward into old wood. The stems may be girdled by cankers and a bacterial ooze forms during warm, humid conditions. Avoid high temperatures, high humidity, and unnecessary syringing.

Several fungi cause leaf spots but infected leaves can by picked off and destroyed.

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