150 MAINE AGRlCUIvfURAI, EXPERIMENT STATION. I9IO. 



the apple maggot (Rhagoletis pomonella Walsh), the cherry 

 fruit flies (Rhagoletis cingulata Loew. and Rhagoletis fausta 

 O. $.), the currant fruit fly (Epochra canadensis L,oew.) and 

 the imported onion fly (Phorbia cepetorum Meade).. The 

 methods adopted and the results obtained by the different in- 

 vestigators in the control of the apple maggot are given in the 

 following paragraphs. 



O'Kane* used a "mixture of. arsenic, molasses and water 

 distributed over the leaves of the tree," to control the apple fly 

 in New Hampshire. "Through the cooperation of growers this 

 plan of spraying was tried at several different points. In most 

 the results were negative. It seems probable that in these in- 

 stances the possible value of the treatment was obscured by the 

 proximity of other infested trees not so treated. Also owing 

 to the pressure of other work the grower was unable to apply 

 the spray as often as would be needed in order to keep the 

 poisoned sweet ready for the flies throughout their egg-laying 

 season. In one instance, however, the treated tree stood alone, 

 and this tree was given repeated sprayings as primarily planned. 

 The variety was August Sweet and the fruit had been worth- 

 less for years. This tree yielded this season practically perfect 

 fruit." 



An experiment to combat the apple fruit fly with the poisoned 

 bait spray, was conducted at the Maine Agricultural Experiment 

 Station. Johannsen and Patchf write, "Our own experiments 

 made this season upon two Tolman Sweet apple trees, using a 

 spray of arsenate of lead and brown sugar in solution gave 

 discouraging results." 



During two seasons, IllingworthJ experimented with the 

 poisoned bait spray to control the adult of the apple maggot in 

 New York. In the season of 191 1, the larvae were already at 

 work in the Primate apples w'hen he began to spray. "Sweet- 

 ened arsenate of lead proved effective but was rather slow." 

 Quick results were desired, and potassium arsenate, a soluble 

 poison, was used together with syrup diluted with water. IU- 

 ingworth (1912, p. 165) observed that the trypetids fed on the 

 sprayed fruit shortly after the application of the spray. These 



*New Hampshire Station Bui. 151, pp. 42-44. 



tMaine Station Bui. 195, p. 238. 



tNew York (Cornell) Station Bui. 324, pp. 126-187. 



