MAINU AGRICULTURAL EXPERIMENT STATION. IQIO. 437 



Formula 14. 



Lead arsenate 1-3 pounds 



Bordeaux mixture (Formula i).... 50 gallons 



Formula 15. 



Lead arsenate 1-3 pounds 



Self-boiled lime-sulphur (Formula 3) 50 gallons* 



Formula 16. 



Lead arsenate 1-3 pounds 



Home-boiled lime-sulphur (Formula 



4 diluted to summer strength, p. 



432) 50 gallons* 



HOW TO SPRAY. 



To do really good and effective work in orchard spraying 

 requires constant care and watchfulness on the part of the 

 operator, and also requires a certain amount of practice to 

 secure the best results. Thoroughness is very essential, but by 

 thoroughness is not meant drenching the tree. The spray 

 should be delivered with a constant, strong pressure, issuing 

 from the nozzle in a fine mist, the finer the better. The oper- 

 ator after a little experience will find that if he moves the 

 extension rod carrying the nozzles at the proper rate and the 

 right distance removed from the leaves he as enabled to cover 

 them thoroughly with a fine mist-like coating, provided the 

 proper type of nozzle is used, and there is no tendency for the 

 mixture to gather together in large drops on the leaves or drip 

 off from the edges. While avoiding applying enough of the 

 spray to cause dripping care should be taken to reach the foliage 

 and limbs on all parts of the tree. It is impossible to do thor- 

 ough spraying in trees which have not been properly pruned 

 and in which the tops are filled with water-sprouts and inter- 

 locking branches. In large orchards three men can usually 

 work to advantage, — one to drive the team and work the pump, 

 the others to handle the nozzles. 



* Paris green should never be used with lime sulphur. Lime sulphur 

 and arsenate of lead should not be used in gas sprayers in connection 

 with carbon dioxide gas, since by chemical action of these ingredients 

 •ipon each other arsenic is set free which may injure the foliage. 



