156 



THE MONTHLY BULLETIN. 



required, a Ijrass syringe, holding just a pint, was found to be the most 

 satisfactory implement for applying the poison. * * * The first 

 spraying was done on June 10th, the bait being made as follows : 



Arsenate of lead 3 ounces or 5 pounds 



Cheap molasses 1 pint or 3 gallons 



Water 4 gallons or 100 gallons 



No heavy rains followed, which was favorable to the experiment. 

 No flies were found on the sprayed trees after a few days, and even 

 on the check trees they became very scarce by the 24th of June, when 

 the first females were observed ovipositing. * * * 



Although no flies could be found on the sprayed trees, a second treat- 

 ment was given on June 24th in order to insure safety. No flies could 

 be found even on the check trees after June 30th, and it was feared 

 that all the flies had succumbed to the treatment before they had 



Fig. 56. — The female of the yellow currant and 

 gooseberry fruit fly, Epochra canadensis. En- 

 larged. (Original.) 



deposited enough eggs in the checks to give results. By July Sth, how- 

 ever, numerous half- grown maggots were discovered in the last row of 

 the checks. The fruit on rows 12, 13 and 14 appeared to be fairly free 

 of infestation. The brown rot developing in most of the cherries that 

 contained maggots made it an easy matter to find them. A slight 

 infestation showed on the last two rows (10 and 11) of the sprayed 

 trees, but the others were remarkably perfect. There was also very 

 noticeable lessening of brown rot and curculio injury on the sprayed 

 fruit. 



Two crates (sixty-four quarts) of apparently perfect fruit were 

 picked on July 12th from the two middle trees of the first sprayed 

 row. All this fruit was opened in order to determine whether any 

 maggots were in it. The first crate, most of which was picked from 

 the top of a rather tall tree, developed seventeen maggots, Avhile the 

 second crate had only two. A careful estimate of the number of 

 cherries in the two crates Avas 12.800, making an average of about 674 

 perfect cherries to one cherry that contained a maggot. A careful 

 estimate was made also by picking about a crate of fruit from the 

 check trees. This fruit was so badly affected by the brown rot and 

 curculio that it was hard to get a correct record. Fully one-third of 



