MAINE AGRICULTURAL EXPERIMENT STATION. J I 



If whole-leaf tobacco is used, prepare as above, using one 

 pound of tobacco to each four gallons of water. 



No lime or other alkaline substance should be added to the 

 tobacco while cooking. Apply at once or within a few days 

 after making, if possible. 



Certain reliable extracts such as "Black Leaf," "Black Leaf 

 40," and "Nikoteen" are on the market and can be secured 

 through local druggists. The Black Leaf preparations are 

 manufactrued by The Kentucky Tobacco Product Company, 

 Louisville, Ky., and are carried by the Collins Hardware Com- 

 pany, 97 Friend St., Boston, Mass. Nikoteen is manufactured 

 by The Nicotine Manufacturing Company, St. Louis, Mo., and 

 can be secured from Joseph Brick & Sons, 47-54 N. Market 

 St., Boston, Mass. 



Directions for use come with the products. There is nothing 

 to do in the preparation of these extracts except to stir the con- 

 tents of the can before pouring out any quantity for dilution. 

 In most cases one gallon of the Black Leaf will be found suf- 

 ficient for each seventy gallons of water. But if in the treat- 

 ment of any louse this does not seem sufficient it may be used 

 in proportion of one gallon to sixty or sixty-five gallons of 

 water. Careful sprayers have usually succeeded in killing plant 

 lice with this preparation in the proportion of one gallon to 

 each one hundred gallons of water. Thoroughness of applica- 

 tion is of as much importance as the strength of the material 

 used. 



Nikoteen is a more concentrated abstract, 1 part being used 

 with from 400 to 600 parts of water. 



Black Leaf 40 is a concentrated solution of nicotine-sulphate 

 and is widely and successfully used in large western orchards, 

 at the rate of 1 part to 700 or 800 parts of water. Some have 

 been successful with 1 part to 1000 parts of water. 



It is the common practice to add soap, — whale oil soap or 

 good laundry soap at the rate of 2 bars to 50 gallons. This is 

 to lessen the formation of drops, causing the spray to cover 

 surfaces more in the form of a thin film. 



Better success is obtained by some by using a little lime 

 instead of soap, the inert solid in suspension aiding the extract 

 to "wet" and "stick" to the bodies of the aphids. For this pur- 



