INJURING THE CANES. 105 



Remedies. — These insects can easily be destroyed 

 by dusting or spraying the infested bushes with 

 powdered hellebore. In spraying, use from one-half 

 to one pound of hellebore to fifty gallons of water. 



INJURING THE CANES. 



The Raspberry Cane-borer. 



Oberea bimaculata. 



The adult of this insect is a slender-bodied, black 

 beetle, with a yellow collar just behind the head. It 

 appears early in summer, usually during June in 

 the Northern States, and deposits eggs in the green 

 canes of raspberries and blackberries. The process 

 of oviposition is peculiar : the beetle makes two trans- 

 verse rows of punctures, about half an inch apart, in 

 the cane, towards the tip, and midway between these 

 she deposits the egg. The rows of punctures make 

 up a kind of girdling which causes the tip of the 

 cane to wither. A short time after the egg is de- 

 posited, it hatches into a small cylindrical larva that 

 bores downwards through the pith. By autumn 

 they have frequently reached the bottom of the cane, 

 where they change to pupse, and the following June 

 emerge again as beetles. 



Remedies. — Soon after the canes are punctured 

 by the beetle they wilt : consequently, if they are ex- 

 amined about midsummer, affected canes can easily 

 be distinguished, and they should then be cut off 

 below the lower ring of punctures, and burned. If 



