CALIFORNIA FRUITS: HOW TO GROW THEM 



Disinfecting such materials on a larger scale with hydrocyanic 

 acid gas may be done in this way : 



Use square canvas sheets, sixteen to twenty feet in diameter, made of 

 the best ducking, double stitched and then painted with boiled linseed 

 oil to make it gas-proof. To fumigate evergreen stock use one ounce 

 of cyanide of potassium (in lumpte, not pulverized), one fluid ounce of 

 commercial sulphuric acid, and two fluid ounces of water, to one hundred 

 cubic feet of enclosed space. For deciduous and hardy trees, when dor- 

 mant use one-fourth more of each of the above. When the canvas has 

 been 'placed over the stock to be fumigated, prepare the charge. Take a 

 three or four-gallon glazed earthenware jar, into which pour the necessary 

 quantity of water, then the sulphuric acid, and place it well under the can- 

 vas the edges of which are secured with soil or in some way so as to 

 prevent the gas escaping, with the exception of the edge immediately 

 in front of the jar. The proper amount of cyanide of potassium is then 

 dropped into the jar from a long scoop, and the tent is immediately 

 closed and remains so for one hour. 



Formula 21 is used for dipping nursery stock. 



INSECTICIDES 



Recipes and hints for use of insecticides may be summarized as 

 follows : 



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 frequently. 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: 



If of 32 deg. Baume dilute 1 to 9. If 36 deg. dilute 1 to 11. 



Either of the above for San Jose and other armored scales to be ap- 

 plied during dormant season, preferably in early winter or early spring. 

 For Peach Moth, as the buds are expanding in the spring. 



3. Distillate 28 deg. to 34 deg. Baume: 



Distillate, 10 to 20 gallons; water, 200 gallons. 



For use only with power sprayer with good agitator, which is neces- 

 sary 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 

 trees from moss. 



5. Distillate Emulsion: 



Stock emulsion: Hot water, 12 gallons; fish oil (see 10) or whale-oil 



soap. 30 pounds; distillate 30 deg. to 34 deg., 20 gallons. 

 f Add soap to hot water in spray tank with agitator going. After soap 

 issolved add oil slowly, keeping mixture agitated. Pump out through 

 nozzle at 175 pounds pressure in storage tank. 



For use take: Stock emulsion, 11 gallons; blackleaf, 40, 1 pint; 

 water, 200 gallons. 



