556 Report of Entomologists op Experiment Station. 



and at the same time rub off the beetles and larvae which drop into 

 the tank. 



A lighter machine is made after the same general plan for hand 

 use. The chief difference in construction between this and the 

 horse-power machine is the wheel which is placed in front, after the 

 principle of a wheel-barrow. 



These machines are put in use about the first of June and kept 

 running while the beetles remain numerous. One grower told me 

 that he killed about ten bushels of the beetles on 20 acres of 

 willows with one of the hand power machines during the early part 

 of the season, and another that he killed three bushels of beetles in 

 one day from 18 acres of willows, the same kind of a machine being 

 used. Judging from numerous heaps of dead beetles along the 

 borders of the fields, these statements were not exaggerated. 



The Beetles on Carolina Poplars at Syracuse, — June 20 Messrs. 

 Smiths, Powell Co., wrote us that the "Willow beetles" and grubs 

 were attacking a block of Carolina poplars and threatened to ruin 

 them. Upon a previous occasion they had used Paris green, London 

 purple, kerosene emulsion and lime in an effort to exterminate the 

 insects, but all to no avail. The only insecticide which they found 

 at all effective was hellebore. 



The writer visited the above nursery July 5 and found that most 

 of the grubs had pupated, although both larvss and beetles were 

 to be found in comparatively small numbers, A block of Korway 

 poplars near by was also found infested. 



In the block of Norway poplars, the insects were much more 

 numerous on the tender leaves of a few suckers, which had been 

 allowed to grow up between the rows, than upon the leaves of the 

 young trees themselves. 



The insects were promptly checked in their work by hand picking 

 and also by crushing the'pupae and grubs. 



