INSECTS INJURIOUS TO VEGETABLES 



Fig- 23x.— Hand barrel spray with cart in operation i 

 (After Orton, U S. Dept. Agr.) 



. cucumber field 



be made by fastening planks across two pieces 2 or 3 x 4 inches 

 and with rounded ends for runners. Two-wheeled carts may 

 also be used for such an outfit. Such a one designed for spray- 

 ing four rows of plants and from two sides at once is used by 

 Prof. F. L. Washburn of the Minnesota Experiment Station 

 (fig. 24). 



Fig. 24-— A four-rgw sprayer- (After Washburn) 



