420 PROTECTION AGAINST PLANTS. 



8. Classification of Forest Weeds according to their Powers 

 of Injury to Forests. 



Hess has classified forest weeds as very injurious, less, and 

 least injurious. As the amount of harm that weeds occasion 

 varies greatly with circumstances, it would appear to be 

 sufficient to give the following list of the most injurious 

 forest weeds : 



WOODY PLANTS. 



Broom (To conifers). 



Heather. 



Brambles. 



Aspen. 



Bilberry. 



Mistletoe. 



Loranthus. 



Blackthorn. 



Forest Willows. 



Birch. 



Honeysuckle. 



HERBACEOUS PLANTS. 



Grasses. 



Bracken. 



Sphagnum. 



Dodder. 



Bindweed. 



Epilobium. 



And other tall weeds, when growing in masses. 



