18 The Bulletin. 



green in liquid form should always be accompanied by unslacked 

 lime, as this counteracts the burning effect of Paris green for tobacco 

 spraying. The following formula is recommended : 



1-1% pounds stone lime. 

 4-6 ounces Paris green. 

 50 gallons water. 



In preparing this mixture the lime should be slacked in a small 

 amount of hot water, using j ust enough to keep the lime from burning 

 dry. As soon as the lime is slacked, it should be stirred into the 

 whole amount of water, and the Paris green (which has been pre- 

 viously mixed with just enough water to make a thin paste) is then 

 stirred in. Twenty to 50 gallons of this mixture is usually sufficient 

 to spray an acre of tobacco. 



In using Paris green in dry form, it should be mixed with cheap 

 flour, dry air-slacked lime, or other dry, finely powdered substance. 

 These substances do not add anything to the value of the poison, but 

 simply act as carriers to make it possible to apply the mixture more 

 uniformly. The usual formula is 



20 to 30 pounds flour or lime. 

 1 pound of Paris green. 



In preparing the dry Paris green mixture, care should be taken to 

 see that the Paris green is thoroughly mixed with the other substance 

 used. The whole mass when thoroughly mixed will be of a uniform 

 light-green color without any streaks or lumps of darker green. From 

 one-half to one pound of pure Paris green will cover an acre of to- 

 bacco when used in this way. Paris green in the dry form is applied 

 preferably while the dew is on the plants or just after a rain, as it 

 will stick much better when used in this way. 



Kerosene Emulsion. — The use of this spray mixture for Flea Bugs 

 in tobacco seedbeds was not attempted until too late to give it a very 

 thorough test. A heavy drenching spray of this mixture was applied 

 to the remnants of tobacco plants left in the seedbeds and a noticeable 

 reduction in the number of Flea Bugs was noticed. Even with this 

 heavy drenching spray only a very slight burning effect was noticed 

 on the tobacco — so slight, indeed, as to be absolutely disregarded in 

 practice. This spray promised excellent things when used against 

 the Flea Bugs, but inasmuch as our experiments have not been carried 

 far enough to be conclusive, it should be used only in an experimental 

 way, if used at all, and if it proves successful under your conditions, 

 it may be used more extensively the following year. 



Kerosene emulsion is usually prepared according to the following 



formula : 



i(» pound laundry or soft soap. 



1 gallon water. 



2 gallons kerosene. 



