NORDMANN'S SILVER FIR 417 



Of Insects. On the whole these are not very destructive. 



Cockchafer grubs gnaw the roots of young plants. 



The Giant or Yellow Wood Wasp ( Sirexgigas), bores 

 into the boles of the Silver. Fir, and also of Larch and Spruce. 



Hylobius abietis sometimes gnaws the bark of young 

 stems, up to about 7 years of age. 



Nordmann's Silver Fir. This is native to the mountains 

 in the south-east of Europe, and is said to have been intro- 

 duced in 1845. 



It is of about similar value to, and may be cultivated in 

 the same manner as, the Common Silver Fir. It has the 

 advantage of being less liable to be injured by spring frosts, 

 as its growth in spring starts very much later than the 

 common variety. 



According to some writers, it can endure more shade even 

 than the Common Silver Fir. 



Abies concolor is well worth an extensive trial. It trans- 

 plants better than most of the other Silver Firs ; and the 

 trees are quicker growing when young than most of the other 

 varieties. It is less injured by spring frosts ; and will grow 

 on considerably drier soils than any other of the Silver Firs. 



Abies grandis is recommended by some. It appears to 

 be somewhat hardier, and rather quicker growing when 

 young, and, also, more easy to transplant than the Common 

 Silver Fir. 



2 D 



