300 agriculture; of mains. 



place, as the aphis on the roots would be likely to inoculate the 

 ground, and it wouldn't do to set another apple tree in the same 

 place. The insect couldn't live on a plant or pear tree. 



INFESTING TRUNK AND BRANCHES. 



Round-headed apple borer, Saperda Candida. This is a light 

 gray beetle about one inch long with a white stripe on each 

 wing cover. See Fig. i6. The female generally appears in 

 July, although I have found them on the apple trees as late as 



Fig. i6. Round-headed Apple borer, Saperda Candida. Life size. 



(Hitchings.) 



August 17th. They usually lay their eggs around the trunk of 

 the young trees just above the ground. These soon hatch into 

 minute grub-like borers that work their way into the tender 

 bark. Here they feed and burrow for the first season ; the next 

 year they work their way into the wood, sometimes girdling the 

 tree and causing its death. They reach their growth the 

 second year and appear again as perfect beetles ready to lay 

 their eggs for another generation. 



A young orchard should be carefully watched for the first 

 appearance of these pests. Their presence can be determined 

 by examining the trunks just above the ground. This should 

 be done several times during the summer. If fine patches of 

 what seems to be sawdust are found in little bunches around 

 the trunk, carefully hunt for the intruder and if found it can 

 be destroyed with the point of a sharp knife without injuring 

 the tree. 



M 



Fig. 17. — Flat-headed Apple borer, Chrysobothris femorata. Life-size. 



(Hitchings.) 



