FORTY-THIRD ANNUAL REPORT. 125 



For spraying from a barrel, the writer has found the following method 

 very useful : Place from one-quarter to one-half pound of good lump 

 lime, or unslaked lime, in each of three or four tin pails which will 

 hold about three quarts or less. Old cans or crocks will answer just as 

 well. Add enough hot water to slake it into a thin cream or paste. 

 Now add to each lot, one-quarter pound of paris green, previously 

 weighed out, and placed in paper bags, stir while the lime is hot and 

 allow to stand for some time. Kow measure out about forty-four gallons 

 of water in your spraying barrel, and make a mark that will show 

 how high it comes in the barrel, add the contents of one tin pail (viz., 

 -one-quarter of a pound of paris green and one-half pound of quick-lime 

 slaked) into the forty-four gallons of water in the barrel. Stir well and 

 spray. The pails or crocks can be used one at a time and refilled occa- 

 sionally so that the stock is always on hand ready for use. 



ARSENATE OF SODA — KEDZIE FORMULA. 



This form of poison was originated at this Station by the late Dr. 

 R. C. Kedzie. 



This is a cheap, effective poison that can be prepared at home. It 

 is used by many of the grape growers of Michigan in combination with 

 the bordeaux mixture. It cannot.be used in the lime-sulphur spraj'S. 

 If used alone — as is sometimes done for potato bugs — slaked lime must 

 be added or the foliage will be burned. 

 The formula is: 



White arsenic -. 2 pounds 



Sal Soda (commonly called washing soda) 8 pounds 



Water 2 gallons 



Boil these materials in any iron pot or kettle not used for other pur- 

 poses for about 15 minutes or until the arsenic dissolves, leaving only 

 a small muddy sediment. Put this solution into a jug or other vessel 

 that can be closed tightly and labeled "Poison." 



One quart of this solution is equal to i/^ pound of Paris green. For 

 most spraying one quart in 50 gallons of water (with some lime) or bor- 

 dejiux mixture will be sufficient. 



CONTACT INSECTICIDES, FOR INSECTS THAT SUCK. 



KEROSENE EMULSION. 



Place two gallons of ordinary kerosene in a warm place, either in 

 a warm room or in the sun, and allow to become as warm as possible 

 without danger from fire. Boil one pound of laundry soap or whale oil 

 soap in a gallon of soft water until completely dissolved. Remove the 

 soap solution from the fire, and while still boiling hot, add the kerosene 

 and agitate vigorously for ten minutes, or until the oil is emulsified, 

 with a spraying pump by forcing the liquid back into the vessel from 

 which it was pumped. When the liquid is perfectly emulsified it will 

 appear creamy in color and will flow evenly down the side of the vessel 

 when allowed to do so. Care should be taken to completely emulsify the 

 oil and this is accomplished much more easily when the mixture is hot. 



This strong emulsion may now be readily diluted with water and used, 

 or it may be stored away for future use. When cold it becomes like 

 sour milk in appearance and should be dissolved in three or four times 



