122 



THE REPOET OF THE 



No. 36 



Means of Contkol. 



The question of controlling the insect has been discussed chiefly by Davis/ 

 who recommended two methods: (1) the growing of another crop, such as carna- 

 tions, instead of roses for one year and (2) the thorough cleaning of the house in 

 midwinter, at which time the insects are dormant in the soil, the plants to be 

 removed and destroyed, all earth in which they have been grown and which may 

 contain puparia to be also removed and deeply buried at some distance from the 

 infested houses, and further that all rubbish beneath benches be also removed and 

 ihe earth, floors and benches afterwards sprayed with a contact insecticide such as 

 kerosene emulsion. 



Fumigating greenhouses with hydrocyanic acid gas will, of course, destroy 

 the flies, but such fumigation has not proved to be a practical remedy. In an 

 infested house it is advisable to go over the plants every day, if possible, to remove 

 the injured buds, which should afterwards be burned. 



As to controlling the insect in gardens, Mr. Wood tried many methods to 

 exterminate it but found that the only satisfactory way was to cut off all the green 

 shoots. Such cuttings, of course, should be burned promptly. 



EXPERIMENTS IN THE CONTROL OF THE POPLAR AND WILLOW 

 BORER {Cryptorhynchus lapatlii Linn.). 



Robert Matheson, Ithaca, N.Y. 



The Poplar and Willow Borer is a serious pest in nurseries of New York State 

 and at present is doing much damage. It is also a serious pest to ornamental 

 poplars and willows, including basket willows. The most extensive depredations 

 of this pest occur in nurseries where large blacks of these trees are grown, and in 



Cryptorhynchus lapathi. Adult. 



Egg puncture at side of lenticel. 



some cases the annual loss is very considerable. During the past three years, as 

 time would permit, control experiments have been conducted in two of our large 

 nurseries. This work has been made possible through the courtesy of the pro- 

 prietors, and to them I desire to express my thanks. 



^27th Rep. State Ent. 111., 111. 



