half of the canopy as among fruit sampled at head height 

 at the inner half of the canopy, with injury among fruit 

 sampled in the upper part of the canopy (above head 

 height) bemg slightly though not significantly less (Figure 

 5). In this experiment, odor sources were positioned at 

 head height and near the tree trunk. 



Conclusions 



Our findings indicate that perimeter-row trap trees 

 baited with one dispenser of GA plus four dispensers 

 of BEN performed as well as or better than trap trees 

 baited with greater or lesser amounts of these 

 attractants. They also indicate that the distance over 

 which a trap tree baited with such an amount of odor is 

 effective in luring PCs extended to at least 34-36 yards 

 along a perimeter row of apple trees and that trap trees 

 at comers of orchard blocks were equally as alluring to 

 PCs as perimeter-row trap trees midway between 

 comer trees. Further, our findings suggest that within 

 the canopy of a trap tree, PC injury to fruit tended only 



slightly (and not significantly) to be concentrated near 

 the source of attractive odor when such odor was 

 positioned at the periphery of the canopy. When 

 attractive odor was positioned near the center of the 

 canopy, fruit injury tended to be rather evenly distnbuted 

 among various sectors of the canopy. 



Together, these findings set the stage for an 

 experiment to determine a threshold of injury to fruit 

 on a trap tree that would justify spray applied to 

 perimeter rows 1 and 2 to control PC following 

 application of a petal fall spray to all rows. 



A ckn o H'ledgeni en ts 



This work was supported by funds from a USDA 

 Northeast Regional IPM grant, a USDA Northeast 

 Regional SARE grant, a USDA Crop at Risk grant, a 

 USDA Specialty Crops Research grant, the 

 Massachusetts Society for Promoting Agriculture, and 

 the New England Tree Fruit Research Committee. 



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Fruit Notes, Volume 69, Winter, 2004 



13 



