\3 



4,3 b 



E-41 UNITED STATES DEPARTMENT OF AGRICULTURE. 



BUREAU OF ENTOMOLOGY, 

 WASHINGTON, D. C. 



FOREST ENTOMOLOGY 17. 



April 11, 1916, 



Brief Information on 

 SCALE INSECT REMEDIES. 



their preparation. 



Lime Sulphur, 33° Baume (to be used 

 against armored scales only). Pro- 

 curable in the market with directions 

 for dilution and application given on 

 container. 



Soap, preferably a potash fish-oil soap f 



Kerosene emulsion: 



Formula; (a) Kerosene, 2 gals.; 



(b) fish-oil or laundry soap, 1/2 lb.; 



(c) water 1 gal. 



Preparation: (l) Dissolve the 

 soap in boiling water; (2) remove the 

 vessel from fire, immediately add the 

 kerosene and thoroughly agitate 

 the mixture for about 5 minutes until 

 it becomes uniformly creamy. 



Note. To avoid boiling, a naphtha 

 soap may be used, but the quantity of 

 soap must be doubled and the water 

 must be soft (rain water). 



Spraying Substances 



: Amount of Stock to 2 gals, of water. 



: For summer use. : For winter use 



1/2 pint. : 



1 quart. 



1/2 pound. : 



4 pounds. 



3 



! 



1/3 gal. 



! 1 gallon. 



RULES: (l) Spray thoroughly and with force. (2) Trim severely before 

 spraying heavily infested plants. (3) Be sure the mixtures are properly 

 prepared and correctly diluted. (4) Vary the strength of solution in accord- 

 ance with the degree of tenderness of the plants to be sprayed. (5) Cooper- 

 ate with neighbors in equipment and operations or engage reliable persons 

 making a specialty of the work, wherever feasible and conditions warrant it. 

 (6) Let us know your results. 



A. D. HOPKINS, 



Forest Entomologist 



