Methods of Control 369 



be safely combined with Bordeaux, and the desired 

 results obtained. He writes as follows: "For pur- 

 poses 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 strengths of nicotine may be added to the 

 Bordeaux, but no additional effectiveness will be 

 given to the mixture as an insecticide. Any nicotine 

 scdution which contains four hundredths of one per 

 cent, nicotine will be effective in controlling plant lice, 

 provided, however, the work is thoroughly done. " 



Proportions of Combined Sprays 



Bordeaux and Paris Green 



Paris Green ^ pound 



Bordeaux mixture 50 gallons 



Bordeaux and Ar senile of Soda 



Arsenite of Soda I quart 



Bordeaux mixture 50 gallons 



Bordeaux mixture must never be -combined with 

 kerosene emtjlsion, carbolic acid emulsion, and mis- 

 cible oils. 



(d) Potassium Sulphide. Like sulphur this is a 

 valuable fungicide for the control of the powdery 

 mildew. The following strength is recommended: 



Potassium Sulphide 4 oz. 



Water 10 gallons 



34 



