Xkw YoKK AgKICULTUEAL EXPEKIMENT StATIOX. 



819 



Efficient and economical nicotine sprays are " Black Leaf To- 

 bacco Extract " (2.7 per ct. nicotine), one part to 150 parts of 

 water, or " Black Leaf 40 " (40 per ct. nicotine), one part to 1600 

 parts of water. Enough of this spray must be used to drench the 

 insects, an amount best secured by using nozzles of the cyclone type 

 with large-apertured disks with a pressure of 125 to 150 lbs. at 

 the pump. The nozzles must be adjusted to hit the under side of 

 the leaves, the lower one usually being set to throw the spray di- 

 rectly upward and the other two varied to suit conditions. It will 

 be necessary to drive slowly if the foliage is dense ; so that gearing 

 must be provided that will maintain the required pressure even 

 when the outfit is moving at low speed. 



With such a sprayer it will require about 150 gallons of solu- 

 tion to spray an acre of vines with dense foliage; for which the 

 materials will cost about $1.25. 



(Plate XXXVII was also printed in this popular edition.) 



