456 



Diseases of Economic Plants 



used in shade 



Fig. 227. Smaller ma- 

 chines differ essen- 

 tially only in capacity. 



The adaptation of 

 such outfits to various 

 purposes is shown in 

 Figs. 228, 229. 



The Spray Gun. — 

 A recent development 

 in power spraying is 

 the spray gun. By 

 its use one man can 



ing low plants, such as 

 strawberries, potatoes, 

 tomatoes, cabbage, 

 etc. Several nozzles 

 are attached and 

 several rows can be 

 treated at one time. 

 Where a number of 

 acres of truck crops are 

 grown, this sprayer is 

 of great advantage. 



Power sprayers. — 

 For operating commer- 

 cial orchards, power 

 sprayers are a neces- 

 sity, and are almost 

 necessary for large 

 home orchards, con- 

 sisting, for example, 

 of 50 or 60 large ap- 

 ple trees. A modern 

 power sprayer for use 

 in large orchards is 

 illustrated in Fig. 226, 

 a still larger one in 



Fig. 229, — Power sprayer adapted to 

 spraying beans. 



