108 



SIXTEENTH BIENNIAL REPORT 



the control of the cherry fruit flies in Eastern United States and Canada. Our 

 experiments were, therefore, confined to field tests under Oregon conditions to 

 determine if the treatment vvould be equally effective here. 



N / 



FIG. 1. ADULT CHERRY FRUIT FLY (RHAGOLETIS CINGULATA) SHOWING 



GENERAL APPEARANCE— ENLARGED 



FIG. 2. CHERRY FRUIT — SHOWING MAGGOT OF CHERRY FRUIT FLY 



Field spray tests were made at Newberg and Salem in 1918.* Unfortunately 

 the applications were put on a little too late for most effective results, as the 

 adults were already busily depositing eggs when the spray was applied. 



Similar tests were made in 1919, the time of application Iieing more carefully 

 planned. Excellent results in maggot control were obtained. 



In observations of orchards in the Cove section of Union County, Oregon, 

 where the maggot has been present and f airly serious for years, it was f ound 



*The field tests were made by Mr. A. B. Black, formerly assistant in this department. 



