COCCID^. 



235 



inch in thickness, and when such is the case the hark separates from 

 the stem, and the tree ultimately dies in consequence. 



This insect confines its attacks exclusively to the beech (Fa</its 

 sylvatica), and, by reason of its whitish appearance, must not be con- 

 founded with the various species of Chermes (Aphidae) on larch, silver 



Fig. 221. Cryptococcus fagi on beech. (From F. V. Theobald's ' Animal Pests of 



Forest Trees.') 



fir, Weymouth pine, &c. It should also be noted that the " copper 

 beech " is all but immune from this insect - pest. In fact, I have 

 occasionally seen cases where the copper beech was grafted on the 

 common beech, of the pest appearing fairly thick on the stock or 

 common beech portion, and the copper beech portion above having 

 only here and there the smallest possible specks on it. 



