Methods of Control 405 



Each of these preparations is mixed and applied 

 just as if it were used alone. A combination of the 

 ammoniacal copper carbonate with an arsenate 

 would be unsafe, since the ammonia renders the 

 arsenic more soluble, and hence may result in the 

 burning of the foliage. However, it may be safely 

 mixed with the tobacco products. 



Recent investigations by Professor Safro, En- 

 tomologist to the Kentucky Tobacco Products Co., 

 indicates that "Black Leaf 40" may be used with- 

 out soap in combination with such spray chemicals 

 as lime-sulphur, arsenate of lead, arsenite of zinc, 

 and iron sulphate, for controlling sucking and chew- 

 ing insects and fungous diseases. Professor Safro's 

 work further claims that "Black Leaf 40" may be 

 safely combined with Bordeaux, and the desired re- 

 sults obtained. He writes as follows : "For purposes 

 of spraying, add to every one hundred gallons of 

 Bordeaux three-fourths of a pint of 'Black Leaf 40.' 

 As far as safety to the foliage is concerned, much 

 greater strength of nicotine may be added to the 

 Bordeaux, but no additional effectiveness will be 

 given to the mixture as an insecticide. Any nicotine 

 solution which contains four hundredths of one per 

 cent nicotine will be effective in controlling plant 

 lice if the spraying is thoroughly done." 



PROPORTION OF COMBINED SPRAYS 



Bordeaux and Paris Green 



Paris green 



Bordeaux mixture 



pound 

 50 gallons 



J'Arsenite of soda . . 

 Bordeaux mixture 



Bordeaux and Arsenite of Soda 



I quart 

 50 gallons 



