INJURED BARK 53 



sun is confined to trees with a smooth, thin 

 bark, such as the beech and hornbeam. The 

 ash, sweet chestnut, lime, and sycamore also 

 suffer, though in a less degree. Though bark- 

 scorching may be brought about by suddenly 

 exposing tree stems to light and sunshine, 

 as in the case of severely thinning an 

 exposed plantation, or by removing heavy, 

 shade-bearing branches from isolated trees, 

 yet examples are not wanting, on almost every 

 common and in our parks, of trees being 

 injured by direct action of the sun. The 

 effects produced are curious, the first indica- 

 tions being a light, creamy colour of the 

 affected bark through exposure of the cam- 

 bium ; then strips or patches become fissured 

 and fall off, and in severe cases the wood 

 becomes diseased and rotten. 



To trees growing in isolated positions, hot 

 sunshine striking on the bark during early 

 spring, after a wet and cold winter, is most 

 injurious. 



Root injury is a frequent cause of trouble, 

 especially on lawn and standard trees, and may 

 be the result of a knock or injury from a 



