mold on trees - Knowledgebase Question

wallingford, Co
Question by jig52saw
March 4, 2010
what should iuse to get rid of the green mold on the tree could be a fungi

Answer from NGA
March 4, 2010


It's probably lichen, especially if it is a mottled greenish/white color. Lichen (and algae and moss) can grow on tree trunks because of the shade, poor air circulation and moisture in the area. Generally they do not harm trees so you can allow them to grow, or you can spray them with a lime/sulfur (sometimes called Bordeaux) to kill them off. Bordeaux is generally sold as spray for fruit trees so look in that section of the garden center. Lime sulfur sprays will kill the lichen but will not harm the bark of your trees. It may take several seasons for the dead lichen to slough off.

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