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 »VCH OF THE 
 UNIVERSITY OF CALIFORNIA agricultural Experiment Station 
 
 College of agriculture e - j - wickson, director wL i*^ Y" lO 
 
 BERKELEY, CALIFORNIA 
 
 CIRCULAR No. 49 
 
 (February, 1910) 
 
 INSECTICIDES 
 
 By H. J. QUAYLE. 
 
 1. Lime Sulphur: 
 
 Quicklime, 33 pounds; Sulphur, 66 pounds; Water, 200 gallons. 
 
 Sift sulphur through box with screen bottom into boiling tank with 50 
 gallons of water. Add the lime and boil 45 minutes to one hour. Stir fre- 
 quently. Strain through cheese cloth or burlap and dilute to make 200 gallons. 
 If extra lime is desired strain in milk of lime when spray is ready for use. 
 
 2. Commercial Lime Sulphur: 
 
 The standard strength corresponding to the above formula is obtained 
 when commercial solution is diluted 1 to 9. 
 
 Either of the above for San Jose and other armored scales to be applied 
 during dormant season, preferably in early winter or early spring. For 
 Peach Moth as the buds are expanding in the spring. 
 
 3. Distillate: 
 
 A 28° gravity oil refined for tree use. 
 
 Distillate, 12 gallons; Water, 200 gallons. 
 
 For use only with power sprayer with good agitator, which is necessary 
 to make a mechanical mixture of the oil and water. 
 
 For the Brown Apricot, Black, and other unarmored scales, and for Woolly 
 Aphis, to be applied during dormant season, preferably in early winter. 
 
 4. Distillate Potash: 
 
 Distillate, 10 gallons; Lye or Caustic Soda, 5 pounds; Water, 200 gallons. 
 
 Preparation and uses same as under 3. Has the advantage of freeing 
 tree from moss. 
 
 5. Distillate Tobacco: 
 
 Distillate, 4 gallons ; Black leaf tobacco extract, 3 gallons ; Water, 200 gallons. 
 For thrips and plant lice, to be applied by power outfit only. 
 
 6. Kerosene Emulsion: 
 
 Soap, i/> pound; Kerosene, 1 gallon; Water, 10 to 25 gallons. 
 
 Dissolve soap in 1 gallon hot water. Add 1 gallon kerosene. Mix 
 thoroughly with spray pump by turning nozzle back into mixture. 
 
 For plant lice and other sucking insects during growing season, dilute 
 with 20 to 25 gallons of water. 
 
 For Scale insects, Woolly Aphis and other sucking insects during 
 dormant season, dilute with 10 gallons of w r ater. 
 
 Kerosene emulsion can be used on small scale with hand sprayer. 
 
 [over] 
 
7. Miscible Oils: 
 
 . Commercial preparations to be used according to directions. Uses same 
 as 3, 4, 5, and 6. Power outfit for application not necessary. 
 
 8. Straight Kerosene: 
 
 Kerosene or Water White Oil, 20 gallons; Water, 200 gallons. 
 In use for scale insects of citrus trees. Application by power outfit. 
 Occasionally also 2% distillate used for same pests. 
 
 9. Soap Solution: 
 
 Soap, 1 pound; Water, 6-12 gallons. 
 For plant lice. 
 
 10. Tobacco: 
 
 Tobacco stems, 1 pound; Water, 4 gallons. 
 Steep tobacco in 1 gallon hot water. Dilute to 3 or 4 gallons. Or, 
 
 Black leaf extract, 1 gallon; Water, 60-70 gallons. 
 For plant lice, thrips, and other sucking insects during growing season. 
 
 11. Sulphur: 
 
 Dry. — Thoroughly dust over foliage when wet with dew. Hydrated lime 
 sometimes used to increase adhesiveness. 
 
 Spray. — Sulphur, 30 pounds; Lime (as milk of lime), 15 pounds; 
 
 Water, 200 gallons. 
 For red spiders and for silver mite. 
 
 12. Lead Arsenate: 
 
 Lead Arsenate, 6-10 pounds; Water, 200 gallons. 
 First mix arsenate of lead with two or three gallons of water. 
 For Codling Moth, and all defoliating insects. 
 
 13. Paris Green: 
 
 Lime, 5 pounds; Paris Green, 1% pounds; Water, 200 gallons. 
 For Codling Moth, and all defoliating insects. 
 
 14. Hydrocyanic Acid Gas: 
 
 Potassium Cyanide, 1 part; Sulphuric Acid, 1 part; Water, 3 parts. 
 
 Place water and acid in earthenware vessel and add cyanide. To be 
 used under tents or in tight rooms or boxes. 
 
 For fumigating buildings and the like, 1 ounce of cyanide to each 100 
 cu. ft. of space for one hour or more. 
 
 For use against scales on citrus trees. Ordinary dosage in ounces found 
 by multiplying distance around by distance over top of tented tree and 
 pointing off two places. Example: 
 
 Distance around bottom Distance over top 
 
 40 ft. X 20 ft. = 8.0 oz. cyanide. 
 
 15. Carbon Bisulphide: 
 
 For the fumigation of stored products and underground insects, and for 
 squirrels. 
 
 Usual dosage, 1 pint to 1,000 cu. ft. of space. 
 
 Place liquid in saucers or shallow vessels near top of room if convenient. 
 Inflammable: avoid lights. 
 
 For underground insects, a tablespoonful placed in holes a few feet apart. 
 
 For squirrels, an ounce on piec^ of cotton, size of walnut, placed in hole 
 and tamped in.