July, 1914.] THE APPLE MAGGOT. 29 



egg-laying. In turn a heavy crop the second year following is 

 apt to show light infestation. 



As bearing on this point it is interesting to note that 39 growers, 

 in the course of their reports for the year 1909 but without the 

 question being asked, noted that 1909 was a year of exceedingly 

 light yield of fruit. That it was a year of great abundance of the 

 maggot was amply demonstrated. It has also been fairly well 

 ascertained that the two or three years preceding 1909 were, in 

 most sections, years of fair to large yields of fruit. 



Following 1909 there were again seasons of larger yields, and 

 the damage by the maggot diminished, until, in 1912, it became 

 in some sections noticeably less numerous than it had been. This 

 was followed by an excessively light yield of fruit in 1913, due to 

 wide-spread late frosts, and again in 1913 injury by the maggot 

 became severe, with frequent heavy infestation of winter fruit. 

 The relation of the abundance of the pest to severe attack on 

 late varieties of apples will be noted later. 



COMPARATIVE ATTACK ON CULTIVATED APPLES. 



In the winter of 1909-1910 a blank was submitted to growers 

 on which were listed 65 varieties of cultivated apples, including 

 all that were known to be grown to any extent in New Hampshire. 



The grower was asked to indicate opposite the name of each 

 variety his observations or experience as to the amount of damage 

 by the maggot to that variety in his neighborhood, marking 

 each in one of three ways to show that it was (1) known not 

 to be infested, or (2) known to be moderately infested, or (3) 

 known to be badly infested. 



It should be especiallj^ noted that these reports were asked for 

 at the end of a season of great abundance of the maggot in most 

 localities. The net results of this questionnaire represent, 

 therefore, something like the maximum infestation. Some vari- 

 eties here listed as attacked are in many cases free from attack in 

 seasons of less abundance. 



Two hundred and ten growers filled out the blank. A sum- 

 mary of their report is given in Tables 1 and 2. 



