DAMAGE CAUSED BY LOW OR HIGH TEMPERATURE. 21 



sun-burn can often be noted even on large trimmed transplants, 

 and usually results in their dying off. 



Preventive measures consist in the avoidance, so far as possible, 

 of sudden exposure of the edges of woodlands, and of the retention 

 of all branch development there; timely formation of a protective 

 belt by planting up with Spruce can also prove efficacious. Beech 

 trees that have hitherto been growing in the close canopy of 

 high forest, but are retained as standards for the production of 

 large timber, almost invariably after a short time show the occur- 

 rence of sun-burn, so that the retention of such individual 

 standards is not advisable. Sun-burnt stems along the edge of 

 woods should, however, be retained as long as possible, as they 

 remain for a considerable time in active vegetation, whilst, if they 

 be removed, the stems immediately behind them would then be 

 exposed to precisely the same danger. 



