Li. 



a 



LU 



Z3 



Z 

 UJ 



o 



UJ 



a, 



z 

 < 



LU 



BEN BEN BEN BEN BEN BEN 

 GA GA GA GA GA GA 

 ElV LIM E2H Z3H HA 



GA BEN CON 



Figure 1. Mean percent of sampled fruit on trap trees baited with different combinations of odor 

 that received fresh ovipositional injury by plum curculio across 6 weeks from petal fall through 

 June. Means superscribed by the same letter are not significantly different at odds of 19; 1. BEN= 

 benzaldehyde; GA= grandiosic acid; EIV=ethyl isovalerate; LIM= limonene, E2H=trans-2-hexenal; 

 Z3H=cis-3-hexenyl acetate; HA=hexyl acetate; CON= control (without odor bait). 



substantially exceed the effects of adding PC response 

 to BEN alone plus response GA alone. Finally, the 

 findings here indicate that even though each of the other 

 five fruit odor components has been found to be at least 

 somewhat attractive when tested alone, none enhanced 

 the potency of BEN plus GA when used in a blend. 

 Although use of trap trees baited with BEN plus GA 

 appears to be a very promising new approach to 

 monitoring PC, we can not yet recommend it for 

 adoption by commercial growers until the following 

 have been determined: (a) optimum amounts of BEN 

 plus GA to deploy per trap tree, (b) optimum spacing 

 of trap trees along perimeter rows, and (c) percent 

 freshly damaged fruit on trap trees that would justify 

 insecticide application to all peripheral-row trees. Also, 



a commercial supplier of user-friendly BEN dispensers 

 would have to come forward to complement the current 

 commercial supplier of GA dispensers. 



A ckn o H'ledgem eiits 



We are grateful to the following growers for 

 participating in this study: Gerry Beime, Carlson 

 Brothers, Dave Chandler, Don Green, Tony Lincoln, 

 Sean McGlaughlin, Mo Tougas, and Steve Ware. This 

 work was supported by a USDA Specialty Crops 

 research grant (via the Massachusetts Department of 

 Food and Agriculture and the New England Tree Fruit 

 Growers Research Committee). 



*k it it it it 



12 



Fruit Notes, Volume 68, Winter, 2003 



