3. ANIMALS INJURIOUS TO FOREST AND ORNAMENTAL 



TREES. 



THE BIRCH QALL=MITE. 



Eriophyes nidis (Canest.). 



A number of cases of injury and disfigurement to birch trees due 

 to this mite have been reported upon during the past season. 



As I have previously pointed out 1 there are two fungi, Exoascus 

 turgidus and E. betulinus, which give rise to growths on birch trees 

 very similar to those caused by this mite. 



FIG 8. SILVER BIRCH WITH WITCHES BROOMS. 



J 2nd Rpt. Ini. Insects, 1905, p. 8. 



