44 



DISEASES OF ECONOMIC PLANTS 



3 to 6 rows can be treated at one time. Where a number 

 of acres of truck crops are grown, this sprayer is of great 

 advantage. 



Power sprayer. — Still larger sprayers, either geared to 

 wheels to use horse power, or operated by steam or gasohne, 

 are used by the large commercial growers. 



Fig. 14. — Sulphuring machine in use. After Faurot. 



Nozzles. — The nozzle should be one that will throw 

 the liquid into a very fine spray, a mist. From the Ver- 

 morel the liquid issues in the form of a cone-shaped mist. 

 From the Bordeaux nozzle it issues in a fan-shaped spray 

 which is not so fine as that given by the Vermorel type. 

 The Bordeaux nozzle may be used to better advantage to 

 spray tall trees. 



Sulphuring and dusting machines. — These consist of 

 various forms of bellows or blowers driven by hand or 



