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本帖最后由 wxy123 于 2019-3-18 14:03 编辑
我查了一下网。Lichen on tree trunk. (Photo by Nick Polanin.) Lichens are often found on tree trunks, branches and twigs as the bark provides a stable place to reside to collect needed sunlight, rainwater and materials from the air. They grow on healthy trees, as well as stressed or otherwise unhealthy ones.
Some people believe that lichens that grow on trees are killing the trees. While there is still much to be learnt about the interactions between trees and lichens a century of investigation has produced no evidence to show lichens to be a major problem on trees.
They do NOT kill trees. ... Dying trees with fewer leaves to shade their branches provides lots of that. Something is killing your trees, but the culprit isn't lichens. So stop hating on lichens.
Algae, lichens and moss are non-parasitic plant-like organisms that colonise bark, rock and other hard surfaces. Lichens and algae are often mistaken for a fungal disease but, fortunately, they do not harm plants on which they grow.
Copper-sulfate sprayed on lichens on trees will kill the fungus side of the organism. Only use copper-sulfate as a treatment for tree lichen in late spring through early fall. It will not be effective in cool weather. You can also remove tree lichen with lime sulfur.May 8, 2018
看起来没有大碍，可以放心了。
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【三刀厨侠争霸赛】香辣毛豆笋丝炒鸡蓉+健康小吃笋干烤毛豆 (2008-9-21) MaxJay 
发表于 2019-3-18 11:16
