6 STATE HORTICULTURAL COMMISSION. 



Rosin Wash for all Species of Scale Insects on Deciduous Trees. 

 The following are the proportions of materials for the winter 

 wash: 



Rosin 30 pounds. 



Caustic soda (98%) 8 pounds. 



Fish oil 4^ pints. 



Water, to make 100 gallons. 



Place the rosin, caustic soda, and fish oil in a large boiler, 

 pour over them about 20 gallons of water, and cook thoroughly 

 over a brisk fire for at least three hours; then add hot water, a 

 little occasionally, and stir well, until you have not less than 

 50 gallons of hot solution. Place this in the spray tank, and 

 add cold water to make the necessary amount. Never add 

 cold water when cooking. 



Distillate Spray for Young Black Scale on Orange Trees. To be 



used with power machine, fitted with an agitator, speeded at 65 

 or 70 revolutions per minute: 



Distillate 28 2 gallons. 



Water 100 gallons. 



Use only the best 28 distillate and see that a perfect mixture 

 is attained at nozzle before applying to trees. This can be 

 determined by agitating for a sufficient time to thoroughly mix 

 the contents of tank; the time will vary somewhat according 

 to speed and construction of agitator. Examine the mixture 

 at nozzle by holding hand in front of same; when the mixture 

 is at its whitest it is ready to apply. 



When engine stops from any cause, immediately discontinue 

 application of spray. When starting up again, empty hose 

 into tank until the mixture is again at its whitest. Apply 

 spray at a pressure of 160 pounds. 



Do not spray an orchard in need of irrigation. Trees that 

 are not in a thrifty condition should be sprayed with a weaker 

 solution. 



Avoid spraying during the prevalence of high winds, cold 

 weather, or when trees are wet with rain or fog. 



For Red Scale increase the solution to 2^ per cent on orange 

 and to 2-2 per cent on lemon trees, and add one quart of pure 

 turpentine to the 100-gallon tank. 



