7 14 21 



Days of Exposura In Field 



7 14 21 



Day* of Expoaura In Flald 



7 14 21 



Days of Exposure In Field 



< 



9 

 U 



3 



m 



8 



o 



7 U 21 



Days of Exposure In Field 



Figure 1. Effects of duration of exposure to weather in a commercial orchard on 

 effectiveness of sticky spheres in capturing alighting apple maggot flies: (A) proportion of 

 released flies captured, (B) mean number of flies observed alighting, (C) proportion of 

 alighting flies that escaped, and (D) mean % of surface area occupied by previously 

 captured insects. 



cleaning sticky spheres of insects and debris 

 every two weeks to retain reasonable fly captur- 

 ing power for either control or monitoring pur- 

 poses. If spheres are not cleaned, control may 

 fail or thresholds for pesticide treatment would 

 have to be adjusted. 



Acknowledgments 



The study was supported by grants from the 

 USDA Sustainable Agricultural Research and 

 Education Program and the USDA Northeast 

 Regional EPM Program. 



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Fruit Notes, Spring, 1994 



