64 MAINE AGRICULTURAL EXPERIMENT STATION. IO/DI. 



Formula 4a. lead arsenate.* 



Lead Arsenate 1 pound 



Water 50 gallons 



Arsenate of Lead acts slower as a poison than Paris green. 

 It can be kept suspended in the water better than Paris green ; 

 it does not burn foliage and sticks to the foliage better than 

 Paris green. For these reasons it proved, in our experiments in 

 1900, more satisfactory than Paris green. 



WHAT TO DO, AND WHEN AND HOW TO DO IT. 



The treatment at various times during the season and the 

 purpose of the same, briefly stated, are as follows : 



A. Corrosive Sublimate (formula 1) or Formaline (formula 

 ia) : before planting immerse the tubers for two hours, then dry 

 and cut. For scab. 



B. Bordeaux mixture and Paris green (formula 3) or Bor- 

 deaux mixture and lead arsenate (formula 3a) : when the nlants 

 are three or four inches high, or as soon as the potato beetle 

 appears. For potato beetle, flea beetle, and early blight. 



C. Repeat B at intervals so as to keep new leaves protected. 



D. Bordeaux mixture (formula 2) about August 1 to 15. 

 For late blight and rot. 



E. Repeat D after about two weeks. 



Four sprayings are usually sufficient to protect from blight. 



Begin while the tops are still small and spray again as soon 

 as tops have made 6 or 8 inches of new growth and keep this up 

 as long as the tops are growing rapidly. 



Directions for spraying the apple and how to fight cucumber 

 enemies will be sent on application. 



CHAS. D. WOODS, Director, 



Orono, Maine. 



: Swift's Lead Arsenate or Bowker's Disparene. 



