THE CANADIAN ENTOMOLOGIST . 311 



the poisoned bait spray to control the apple maggot in New York. 

 In 1911, he used the following "fly destroyer" as given by Merck 

 to control the apple maggot. 



Parts. 



Syrup 4 or 4 pts. 



Potassium arsenate 1 or 1 lb. 



Water 45 or 45 pts. 



Two applications of the bait were made on July 22 and 26, 

 about a pint being sprayed to the lower branches of a 20-year-old 

 apple tree. In a table the author gives a daily record of windfalls 

 from a treated tree and the number of larvae which bored out of 

 the fallen fruit. All the windfalls collected under the baited tree 

 after August 15 to the end of the season were absDlutely free from 

 larvae. From an untreated tree of the same variety in another 

 orchard, 180 drops were gathered on August 23; from these apples 

 larvae emerged during September, while 115 drops of the same 

 date from the treated tree failed to show a trace of a single maggot. 

 The author concludes, "Hence it is quite evident that the flies 

 deposited no eggs in the fruit of the sprayed tree after the applica- 

 tion of July 26." 



In 1912, Illingworth used the following formula: 



Molasses 1 lb. or 25 lb. 



Arsenate of lead 3 oz. or 5 1b. 



Water 4 gall, or 100 gall. 



- Five applications of the spray were made. The author 

 states, "In the spraying experiments during 1912 most gratifying 

 results were obtained." No mention is made of the number of 

 trees treated and no data are given as to the per cent, of fruit 

 infested of the treated and control trees. 



The author's observations indicate that the codling-moth 

 spray of arsenate of lead alone may control the apple maggot if 

 applied thoroughly to the fruit. 



Ross (17) tested two spray mixtures, one composed of arsenate 

 of lead, glycerine and molasses, and the other Paris green, glycerine 

 and molasses, but neither yielded satisfactory results in the control 

 of the apple maggot in Ontario. 



Cherry Fruit Flies (Rhagoletis cingulata Loew. and Rhagoletis 



fausta O. S.). 

 In the season of 1912 Illingworth (7) adopted similar control 

 measures against the cherry fruit flies. The orchard was four. 



