Lichens Are Not Harmful To Trees

Daniel Gill, West, Lisa  |  7/11/2007 12:15:02 AM

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(Audio 06/04/07) Gardeners may notice poorly-performing plants with grayish-green growths on them. These growths, called lichens, often are blamed for harming trees or shrubs. Lichens are not parasites, but they often live on trees that are already unhealthy.
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