250 1 



Northbofough 



O 

 O 



UJ 



_l 



a. 



Q. 



< 



a: 



UJ 

 CD 



3 



200 



150 



100 



50 • 



Western Mass. 



20 30 

 AUGUST 



10 20 30 

 SEPTEMBER 



Figure 2. Comparison of numbers of apple maggot adults captured on traps at 

 NorlhborouqhC number of adults per trap) and western Massachusetts ( total number 

 of adults captured at Shelbume Falls and Belchertown) during trap survey* of 

 1974. 



bers of other species of flies, they begin to lose their effective- 

 ness by the third week mainly because the stikum tends to dry and 

 drip off the bottom of the trap. Heavy rain also removes the stikum 

 to such an extent that the trap may become essentially ineffective. 

 After heavy rain, the red sphere should be checked and replaced if 

 the stikum has washed off. The red spheres should be replaced at 

 least every 2 or 3 weeks. 



Summary of Results . 



1. The yellow traps and red spheres were equally effective in 

 numbers of apple maggots captured. 



2. The yellow traps were more effective in catching females 

 while the red traps were more effective in capturing males. 



3. The yellow traps attracted a larger percentage of newly 

 emerged females than did the red traps; thus the yellow 

 trap was more useful in predicting early apple maggot 

 emergence. 



