360 MAINS AGRICULTURAL EXPERIMENT STATION. I908. 



the egg bore down the cane. Professor Slingerland's excellent 

 account * of the work of this boring is as follows : 



"They are cylindrical, footless, yellowish grubs, measuring 

 about three-fifths of an inch in length. When first observed in 

 the latter part of July they had made in each case a burrow less 

 than two inches in length ; but after that date the burrows were 

 rapidly extended downward so that they became in many cases 

 two feet or more in length and reached the base of the canes. 

 The burrows are about one-eighth of an inch in diameter ; they 

 wind from side to side of the pith, and at frequent intervals 

 penetrate the woody part of the cane. In some of the cases 

 where the woody part of the cane is penetrated an opening is 

 made through the bark. These openings occur at intervals of 

 a few inches throughout the length of the tunnelled portion of 

 the cane; they are small, being about one-third of the diameter 

 of the burrow; and their object is to enable the larva to deposit 

 its excrement outside of the burrow. It is evident that the 

 larva puts the caudal end of the body at this opening and forces 

 the excrement directly into the open air, for it was found in 

 long strings, some of them a half inch in length, on the sand 

 below the openings ; and the burrows were always free from it." 



The remedy is obviously simple. As soon as the tops begin 

 to wilt the affected cane should be cut off below the lower ring 

 and destroyed. If this is consistently attended to in the spring 

 the insect will be killed in the egg before any real injury by bor- 

 ing is done. When the trouble is not noticed until later in the 

 season all affected canes should be pruned to the ground and 

 burned. 



On June 29, 1908, some canes in the University garden 

 showed evidence of the work of this insect and July 3 the beetle 

 was observed at work. July 8, raspberry canes that grew close 

 by the blackberry bushes showed the girdlings by the beetle. 



From Bridgton, Maine, September 28, 1908, came the follow- 

 ing communication : "I am about to send you red raspberry tops 

 in which are some small whitish grubs. The first signs of these 

 grubs are noticed about the middle of July. A couple of rings 

 of holes appear near the tops of some of the new canes. The 

 tops wither and the grubs bore down the inside toward the 



* 1890. Bui. Agric. Exp. Sta. Cornell University. Entomological 

 Division XXIII. 



