4 - 



3 - 



5 5n 



b 



Q 



Z 2 



< 

 S 



T 1 



0-1 M FROM ODOR 4-5 M FROM ODOR 

 LOCATION 



Figure 4. Mean percent of sampled fruit on penmeter-row trap trees that 

 received fresh ovipositional injury by plum curculio when sampled fruit 

 were within an imaginary circle (1 yard diameter) containing grandisoic 

 acid (1 mg/day) plus benzaldehyde (40 mg/day) or within an imaginary 

 circle (1 yard diameter) lacking odor bait on opposite side of the tree (4- 

 5 yards from odor source). Means superscribed by the same letter are not 

 significantly different at odds of 19: 1 . 



E 1 ■^ 



b 

 O 



S 0.4 H 



0.8 



0.6 - 



< 



0.2 - 



A 



■P 



OUTER HALF INNER HALF UPPER PART 

 LOCATION 



Figure 5. Mean percent of sampled fruit on penmeter-row trap trees 

 baited with grandisoic acid (1 mg/day) plus benzaldehyde (40 mg/day) 

 (both positioned near the center of the tree) that received ovipositional 

 injury (fresh and older injury combined) to fruit at head height in the 

 outer half of the canopy, at head height in the inner half of the canopy 

 and in the upper central part of the canopy in samples taken during the 

 last week of June. Means superscribed by the same letter are not 

 significantly different at odds of 19:1. 



dispensers of GA plus one, two, 

 four, or eight dispensers of BEN 

 (Figure 1). All six of these 

 treatments received significantly 

 more fresh injury than trap trees 

 baited with one dispenser of GA 

 plus one dispenser of BEN and than 

 unbailed trees. Numerically, just as 

 much fresh injury occurred on trap 

 trees baited with one dispenser of 

 GA (releasing 1 mg/day) plus four 

 dispensers of BEN (releasing a 

 total of 40 mg/day) as on trees of 

 any other treatment, with injury on 

 trees receiving this treatment about 

 eight-fold greater than on unbailed 

 trees. 



In the second experiment, the 

 amount of fresh injury on trap trees 

 was significantly greater (about 

 eight-fold greater) than on unbailed 

 trees 34-36 or 25-27 yards distant 

 from trap trees, and was likewise 

 significantly greater (about seven- 

 fold and five-fold greater, 

 respectively) than on unbailed trees 

 1 5 - 1 7 or 7-9 yards distant from trap 

 trees (Figure 2). 



In the third experiment, 

 perimeter-row trap trees located at 

 comers of orchard blocks received 

 an almost identical amount of injury 

 (no significant difference) as 

 perimeter-row trap trees located 

 midway between corner trees 

 (Figure 3). 



In the fourth experiment, there 

 was only a slight (and insignificant) 

 tendency for within-canopy injury 

 on trap trees to be greater in the 

 vicinity (within 1 yard) of the source 

 of attractive odor compared with 

 4-5 yards distant from the odor 

 source (Figure 4). 



In the fifth experiment, a 

 nearly identical amount of injury on 

 trap trees was found among fruit 

 sampled at head height at the outer 



12 



Fruit Notes, Volume 69, Winter, 2004 



