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betchertown 

 University Orchord 

 Orchard Hill 

 She4burn« Falls 



10 20 30 10 20 30 10 20 30 

 JULY AUGUST SEPTEMBER 



Rgure I. Comparjson of total numbers of apple maggot adults 

 captured on trops at the four sampling areas between 

 July 15 and Oct. 3, 1974. 



A few points should be made on our observations concerning 

 the effectiveness of the traps over time. The yellow traps attract 

 large numbers of Tachinid flies which clutter the trap to the ex- 

 tent that fewer apple maggots may be caught and those that are 

 caught are more difficult to find. We found this became a problem 

 by the third week. Therefore, the yellow traps should be renewed 

 at least eyery 3 weeks. Though the red spheres attract fewer num- 



