270 Report of the Departmext of Extomology of the 



as found after the caterjii liars leave the trees. Ten days later 

 the moths will have escaped, and hence it will not pay to gather 

 them after that date. 



As soon as gathered the cocoons should be placed in a box 

 and covered with a coarse wire net to allow the parasites to 

 escape. The imprisoned moths will soo» die or may be killed 

 by sprinkling a little kerosene oil in the box. 



On the whole the season's experience indicates that except 

 when attacking forest trees, the insect is not more difficult 

 to control than many other noxious species. But as with other 

 insect pests prompt and thorough treatment is necessary. 



II. THE FRUIT BARK-BEETLEl 

 Scolt/tus rugulosus Ratz. 



Late in July of the past season Mr. F. C. Stewart of the Station 

 staff brought into the laboratory several small branches from a 

 healthy cherry tree showing the work of some insect. The loca- 

 tion and extent of the injury was plainly indicated >by the dead 

 leaves. On all of the twigs from one-fourth to about three- 

 fourths of the leaves were brown and dead — in sharp contrast 

 to the remainder which were of normal green color. Plate 

 XXXVII, Fig. 1, is from a photograph of one of these branches. 

 All of the leaves on the lower half were dead. An examination 

 showed that in each sjwir bearing the dead leaves a small round 

 hole about the size of the head of a pin had been bored as 

 shown, enlarged about four times, at Plate XXXVII, Fig. 2. 

 In each case the hole opened into a short burrow in the sapwood. 

 About forty burrows were examined at this time. All but three 

 were empty, and in these the canse of the injury, some fruit 

 bark-beetles, Scohjtus rugulosus, were found still at work. Later 

 investigations in the vicinity of Geneva and in Monroe and 

 Niagara Counties showed that this species has caused extensive 

 injury during the past season to healthy, vigorous trees. 



Althougli this species has been long known a® an orchard pest 

 it has been supposed to coufiue its attacks principally to weak, 



