OS 

 b 



Q 



z 

 < 

 u 



8 - 



7 - 

 6 

 5 

 4 

 3 

 2 - 

 1 - 

 



B 



B 



34-36 25-27 15-17 7-9 TT 7-9 15-17 25-27 



DISTANCE (YARDS) FROM TRAP TREE 



34-36 



Figure 2. Mean percent of sampled fruit on a perimeter-row trap tree (TT) baited with grandisoic 

 acid (1 mg/day) plus benzaldehyde (40 mg/day) and on perimeter-row unbaited trees at varying 

 distances from the trap tree that received fresh ovipositional injury by plum curculio. Means 

 superscribed by the same letter are not significantly different at odds of 19:1. 



unbaited. Within a quadrant, lures were positioned at 

 head height withm an imaginary circle about 1 yard 

 from the outennost canopy foliage and 4-5 yards distant 

 from a corresponding imaginary circle on the opposite 



H 



as 

 o 



QC 



5 n 



4 - 



3 - 



S 2- 



6^ 



z 



< 



1 - 



A 



CORNER 



MIDWAY 



LOCATION 



side of the tree. To assess incidence of ovipositional 

 injury near and far from the source of odor, we examined 

 20 apples in each of the two imaginary circles. 



Experiment 5: Representative Sample of 

 Injured Fruit within Trap Trees. 

 In each of eight blocks of 1 8 large- 

 size (M.7 rootstock) apple frees, we 

 chose three perimeter-row trap 

 frees. We examined 20 fhiit at head 

 height in the outer half of the 

 canopy, 20 fruit at head height in 

 the inner half of the canopy, and 20 

 fruit in the upper central part of the 

 canopy in each tree for evidence 

 of ovipositional injury. Sampling 

 was confined to the last week of 

 June. For this experiment, fruit with 

 fresh as well as older damage was 

 counted as injured. 



Figure 3. Mean percent of sampled fruit on perimeter-row trap trees 

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

 located at comers of orchard blocks (intersection of two perimeter rows) 

 vs. midway between and at least 45 yards distant from comer trees that 

 received fresh ovipositional injury by plum curculio. Means 

 superscribed by the same letter are not sigmficantly different at odds of 

 19:1. 



Results 



In the first experiment, there 

 were no significant differences in 

 amounts of fresh injury among trap 

 frees baited with one dispenser of 

 GA plus four or eight dispensers of 

 BEN and frap frees baited with two 



Fruit Notes, Volume 69, Winter, 2004 



11 



