Thk Yuma Mesa 



249 



orchard to cowpeas, tepary beans, and peanuts, all of which made a 

 very substantial q;ri)\vth, see Fig'ure 7. 



INSECT AND I'L.XXT DISKASP: PROBLEIMS ON THE MESA 



A feature of the Mesa as a citrus district not to be overlooked 

 is its freedom from injurious insect and plant diseases. In the' 

 large citrus regions of both (California and Florida, the cost to the 

 growers in the control of these pests is a heavy expense — mater- 

 ially cutting down profits — which serves to emphasize the very 

 great economic advantage of a district where these control meas- 

 ures are unnecessary. It cannot be hoped that the Yuma Mesa 

 will always be entirely free from such infestation, but with the 

 rigid quarantine against foreign importations that is now being 

 maintained in the State of Arizona, it should be a long time before 

 any serious difficulty of this sort arises. 



CHARACTI^R1S'1'ICS OV I'Rl'IT GROWN ON YUMA MESA 



While it is commonlv known that citrus fruits attain the very 

 highest qualitN in an arid soil and climate, special efifort has been 

 made to determine if this in reality applies to the fruit produced on 

 the Yuma Alcsa, and if so in what way and to what extent. Repre- 



Fig. 11. — Citrus orchard of George M. Hill on the Yuma Mesa, S months 



from planting 



