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Sugar Maple Borer. (Plagionotus speciosus). 

 DD. — A whitish hairy grub making a central burrow 

 plugged with sawdust, and cutting off twigs of 

 maple or oak. 

 Twig Primer. (Elaphidion villosum). 

 DDD. — White flattened legless grubs working under the 

 bark of elm; adult a gray beetle with red lines 

 and black spots. 

 Elm Borer. (Saperda tridentata) 

 DDDD. — White legless grubs making large irregular 

 channels in sapwood and inner bark of poplar; 

 large blackened swollen scars on the surface of 

 the trunk and limbs of affected trees. 

 Poplar Borer. (Saperda calcarata) 



Saperda Candida bores into hawthorn, mountain ash, 



and fruit trees, and Saperda vestita into bassM'Ood. 



DDDDD. — Club-shaped grubs, making irregular ugly 



scars opening into burrows in black locust. 



Adult beetle is dull black brightly marked 



, with golden yellow, and feeds on golden rod 



blossoms. 

 Locust Borer. (Cyllene robiniae) 

 ("C — Metallic wood borers or Buprestid beetles. 



D. — Large-headed flattened legless grubs making shallow 

 tunnels. 

 Flat- Headed Borer . (Chrysobothris femorata) 

 DD. — A flattened whitish grub with a large flattened head, 

 making irregular spiral burrows in the inner bark of 

 birch. 

 Bronze Birch-Borer. (Agrilus anxius) 



AAA. — Sucking the juices from twigs or leaves. 

 B. — On the leaves. 



CC. — Producing terminal galls on white and Norway spruce; 

 branch scraggly deformed. 



Spruce Gall Aphis. (Chermes similis) 

 CC. — Producing galls on white and Norway spruce, not ter 

 mmal, pine-apple shaped. 



Spruce Gall Aphis. (Chermes abietis) 

 BE.— On the bark. 



C. — Clusters of woolly aphis. 



Woolly Aphis of Elm. (Schizoneura americana) 



