26 N-. H. AGR. EXPERIMENT STATION. [Bulletin 171 



was followed at later dates by one or more trips by the writer or 

 his assistants in order to make personal observations and to 

 study in detail some of the interesting facts indicated. 



DISTRIBUTION OF THE MAGGOT IN NEW HAMPSHIRE. 



The maggot was found in all localities visited or inquired into, 

 up to the northern limits of commercial apple growing in the state. 

 It is not equally prevalent in all of these towns, but is some factor 

 in all and a considerable factor in most. 



The northernmost point at which the maggot was personally 

 observed was the town of Jefferson, immediately north of the 

 White Mountains. It was abundant in an orchard visited at 

 that point. Some apples are grown in neighboring towns, but 

 these were not visited. In the town of Milan, twenty miles 

 northeast of Jefferson, there are but few apple trees and the 

 maggot is reported not to infest them. In Errol, fifteen miles 

 north of Milan, a few apples grow, and some have been set out 

 five miles still farther north, but the maggot has not been ob- 

 served bj^ the growers. In Colebrook and Dixville, forty miles 

 directly north of Jefferson, a few apple trees grow. No obser- 

 vations are at hand to show whether they are infested or not. 



LENGTH OF TIME ORCHARDS HAVE BEEN INFESTED. 



One hundred and ninety-five growers gave an estimate as to 

 the length of time that infestation had been noted in their 

 orchards. 



Of these 44, or 22.6 per cent, placed the time indefinitely at 

 "several" or "many" years; 47, or 24.1 per cent, had noted their 

 apples infested for five years or less; 35, or 17.9 per cent, placed 

 the time at ten years or less, but more than 5; 31, or 15.9 per cent, 

 gave it as fifteen years or less but more than ten; 24, or 12.3 per 

 cent, had noted infestation for twenty years or nearly so; 8, or 

 4.1 per cent, had observed the maggot for twenty-five years or 

 nearly so; 2 had seen its work for thirty years; 3 for more than 

 thirty years; 1 for forty years. These estimates were made by 

 growers in 1910. Allowing for the fact that infestation undoubt- 

 edly existed in many orchards for some time before it was spe- 

 cially noted by the grower, for a natural tendency to underestimate 

 the time elapsed when the period is a long one, and for the fact 



