April, '11] O'KANE: APPLE MAGGOT CONTROL 175 



The ratio, however, is only thirty-eij2;ht maggots emerging the first 

 week per thousand drops. 



As the season progresses the numl)er emerging the first seven days 



•steadily rises, until it reaches a maximum of 730 per thousand drops 



at the end of this variety's season. In general, throughout the season, 



there is a slight but steady increase from the first to the seventh 



twenty-four hours of each week. 



Taking up now the performance for the second and succeeding 

 weeks that the drops were off the trees: In the early part of the 

 season we find that the number of larvae emerging after the first seven 

 days rapidly rises to a maximum the third week after the apple falls, 

 and then quickly diminishes to a comparatively small number the 

 fifth and final week. 



This rule holds good for every lot through the season of this variety, 

 but as we get farther along the apples rot very soon after they drop, 

 so that the third week off the tree finds them completely decayed, and 

 consequently no more larvae issuing. 



Summing up the entire season records for this variety, and taking 

 an average of all the drops observed, we find that for the first twenty- 

 four hours after the apple falls, eighteen larvae emerge per thousand 

 drops; for the second twenty-four hours, seventeen larvae emerge; 

 for the third, twenty-two larvae; for the fourth, twenty-five; for the 

 fifth, eighteen; for the sixth, thirty-one; and for the seventh, forty- 

 three. Thus we have for the first seven days after the apple falls a 

 total of 174 larvae emerging per 1,000 drops. 



Again, taking an average of all the lots observed, we have for the 

 second week after the apple drops a ratio of 988 larvae per thousand 

 drops; for the third week a ratio of 4,515 per thousand drops; for 

 the fourth week, 1,299; and for the fifth week, 22. 



For the whole season in this variety the total number of larvae 

 issuing per thousand drops was 6,898. 



Considering now one of the earhest of the fall apples, the Sops-of- 

 Wine, we find parallel results, but with the exception that the first 

 seven days after the apple falls show proportionately a smaller number 

 of maggots emerging, the season average being fifty-nine larvae per 

 thousand drops. In the second week this ratio becomes 710 per 

 thousand; in the third week, 2,189 per thousand; in the fourth week, 

 1,473; and in the fifth week, 120. 



The Porter gives a similar performance. Here the season average 

 shows 12 larvae emerging per thousand drops the first week after the 

 apple falls; 242 the second week; 579 the third; 392 the fourth; and 

 67 the fifth. 



Ranking as a little later fruit than the Sops-of-Wine, but still in the 



