39 



writing to me on this subject, says: "We do not inspect any nursery in 

 Ontario for Woolly Aphis": and the reason that Professor Caesar gives 

 is the very one I have just mentioned: "in Ontario the Woolly Aphis is 

 not a very important pest, although it is found all over the Province. I 

 have never seen a tree that you would call very badly injured by this insect." 



Woolly Aphis — (a) deformities on roots, (b) colonies on roots, ^c) woolly aphis. 



The really dangerous form of this insect scarcely occurs at all in Ontario, 

 and I may say never occurs in the Province of Quecbec. I mean the root 

 form which is so destructive in parts of the United States. The aerial 

 form, which is our only common one, frequently causes little galls to form 

 on new shoots and it also sometimes, on a badly infested shoot, will cause 

 small cankered areas around a wound where it has fed; but it is only abun- 

 dant in certain years, disappearing in the next or soon after. 



The Woolly Aphis winters on the elm tree in the egg stage, and in 

 the spring causes the peculiar curling of the elm leaves which we notice 

 so often. Of course, a few may winter in the immature stage on young apple 

 trees, near the base of the tree or under shelter on the bark; but these are 

 very rare and I do not remember having seen any personally in this Province. 



