teinaceous foods, females would respond 

 sooner to ammonium-baited intercep- 

 tion traps than females exposed only to 

 non-ammonium fruit-odor baited traps. 

 As a result, although fly capture might 

 eventually be the same on both types of 

 traps, egg-laying in fruit before capture 

 might be different. 



The relative attractiveness of natu- 

 ral food sources remains to be tested, as 

 does the attractiveness of commercial 

 food baits other than Nulure. We hope to 

 find commercial bait that is specifically 

 attractive to apple maggot flies. An im- 

 portant aspect to be evaluated is that 

 ammonium or other food-type attrac- 

 tants as complements to fruit-odor 

 baited red sphere interception traps do 

 not affect adversely the beneficial fauna 

 in an apple orchard. 



Acknowledgements 



We thank Maryam Mashayekhi and 

 Jung Tang Wang for their help during 

 various aspects of these studies. We also 

 thank Martin Aluja for encouraging us 

 to use his patch of potted hawthorn 

 trees. This work was supported by the 

 Science and Education Administration 

 of the USDA under grant 8700564 from 

 the Competitive Grants Office, and by 

 the Massachusetts Agricultural Experi- 

 ment Station Project 604. 



Fruit Notes, Summer, 1990 



