8 FARMERS BULLETIN 862. 



This spray has been used Avith success for more than a year and is 

 recommended as the preferred insecticide for mealybugs. It has been 

 applied to a very large variety of plants during the winter season 

 without injury. Oranges and lemons are treated safely, though 

 grapefruit has been known to be stained slightly. The grade of dis- 

 tillate is very important, and only that of a gravity approximating 

 28° Baume should be purchased. This is an untreated black oil, very 

 distinct from the stove distillate (32°-34° Baume), which is com- 

 monly used for spraying. The cost of cresolated distillate emulsion 

 is about 1^ cents a gallon. 



SOAP-POWDKK KMT'I.RION. 



Distillate emulsion^ gallons__ .') 



Soap powder poviiKls__ l(t 



Water to make .ujill(>ns__ 1(»0 



Preparation. — Wlieu the Ixittoui of the spray tank is covoriMl witli water, start 

 agitator ami sift in the finely ground soap powder. The distillate emulsion is 

 added when the tank is almost filled. 



Soap-powder emulsion is effective against the mealybug as well a 

 against citrus scales. It is more injurious to the foliage than creso- 

 lated emulsion, however, and may cause moderate or even severe 

 dropping of the leaves unless applied under favorable climatic con- 

 ditions. (See " Season for spraying," p. 9.) The cost is about 

 f cent a gallon. 



HOW TO SPRAY A TREE. 



Trees first should be pruned of all dead wood and opened up so 

 as to allow the ready use of the nozzle on the inside. In spraying 

 for mealybug control the results accomplished are quite as dependent 

 upon the method of application as upon the insecticidal properties oi 

 the material used. The upper, or dorsal, surface of the mealybug i 

 tough and resistant to most commercially usable dips and sprays, 

 the place of greatest vulnerability appearing to be a series of tubes 

 which lie beneath the fringe of wax. This protective fringe, which 

 is very resistant to most insecticides, must be removed by the spraj 

 to insure quick destruction of the insect ; and to effect this remova' 

 careful treatment with a driving spray is required. 



A power machine capable of maintaining 200 to 250 pound; 

 pressure should be used. A ver^^ satisfactory type of nozzle is show 



1 Formula for distillate emulsion: 1 



Distillate (28° Baum6) gallons— 20 | 



Liquid flsh-oil soap do 4 | 



Hot water do 10 I 



Pour hot water into spray tank. Start asitator, then add soap. Next slowly pour IB 

 distillate. I'ump back into itself through nozzle for 20 minutes, after which pump throug! 

 fine nozzle into storage tank. This emulsion keeps indefinitely. 



1 



