450 STATE BOARD OF AGRICULTURE. 



indicate that the former was most effective. A badly infested tree was com- 

 pletely cleared of the pests by spraying with pyrethrum in water by means of 

 a fountain pump. As stated by Mr. Saunders in the above quotation, hellebore 

 is sure death to them. Either this substance or pyrethrum is preferable to 

 the deadly arsenical compounds which doubtless would be equally efficacious 

 in destroying them. The kerosene and soap mixture would, without doubt, 

 also kill them. 



