Unbailed Baited 

 Pyramid 



Unbailed Baited 

 Cylinder 



Unbailed Baited 



Plexiglas at 



Perimeter Apple Trees 



Unbailed Baited 



Plexiglas at 



Woods 



Trap type 



Figure 2. Captures of plum curculios on unbailed and baited pyramid, cylinder, or clear Plexiglas traps in unsprayed 

 orchards. Bars not superscribed by the same letter are significantly different at odds of 19 to 1 . 



crawling toward pyramid, cylinder, or circle traps, 

 could have negated attractiveness of limonene and/or 

 grandisoic acid. 



None of the unbailed or baited traps placed adja- 

 cent to, beneath, or within apple tree canopies repre- 

 sented improvement over traps tested in 1 998 in terms 

 of ability of trap captures to reflect the time of occur- 

 rence of PC injury to fruit. It is of little value to spend 

 more time and effort to deploy PC traps in association 

 with apple trees if one can not realize a principal ben- 

 efit of doing so: being able to predict time periods when 

 PC injury is most likely to occur based on increases in 

 captured PCs. Further research is needed to achieve 

 this benefit. 



Acknowledgements 



We are grateful to the eight commercial growers 

 (Bill Broderick, Dana Clark, Dave Chandler, Dave 

 Cheney, Dave Shearer, Joe Sincuk, Tim Smith, and Mo 

 Tougas) who participated in the study and to Jim 

 Hardigg in South Deerfield, who permitted use of his 

 unsprayed orchard at Hardigg Industries. This work 

 was supported by awards from the New England Tree 

 Fruit Growers Research Committee, the USDA North- 

 east Regional Integrated Pest Management Competi- 

 tive Grants program, SARE, and Massachusetts State 

 and Michigan State Integrated Pest Management funds. 



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Fruit Notes, Volume 64 (Number 3), Summer, 1999 



