amount of PC injury to fruit located in trees having a 

 trap or in adjacent trees. A strong positive correlation 

 (i.e., a value close to 1) would indicate that high PC 

 captures reflect high damage to fruit by PC, and that 

 low PC captures reflect low damage to fruit. If a strong 

 correlation were found, we would be able to predict 

 fruit injury based on trap captures. However, we found 

 that all trap types (even the unsprayed ones) showed a 

 poor ability to predict injury to fruit by PCs based on 

 captures. Even though the strongest correlation (0.56) 

 was found in the case of sprayed pyramid traps, the 

 fact that few PCs were captured by traps of this type 

 during the first 10 days does not allow us to consider 

 such a correlation as convincing. 



Figure 3 shows that, in each one of the three time 



periods after insecticide application, fruit located in 

 trees bearing both sprayed and unsprayed traps received 

 consistently more damage than fruit located in adjacent 

 trees. Such a pattern was especially pronounced after 

 20 days, when fruit injury was 2.4 times greater on 

 trees bearing sprayed traps than on adjacent trees and 

 about 1 .9 times greater on trees beanng unsprayed traps 

 than on adjacent frees. 



2002 Field study. Figure 4 reveals that regardless 

 of the time period elapsed since insecticide spray, the 

 application of Imidan® seems to have had little 

 influence on the ability of any frap type to capture PCs. 

 Both types of Circle fraps captured similar numbers of 

 PCs, and these two trap types captured substantially 

 more PCs than small pyramid or cylinder traps. 



1-6 DAYS 



■ sprayed 

 D unsprayed 



Circle metallic Circle plastic 



Pyramid 



12 n 



(A 



^ 10 H 



i S 



c 

 rs 



0) 



6- 

 4- 



2- 



7-12 DAYS 



Cylinder 



■ sprayed 

 D unsprayed 



Circle metallic 



Circle plastic Pyramid 



TRAP TYPE 



Cylinder 



Figure 4. PC captures by each type of odor-baited trap placed on perimeter-row trees (2002 field 

 study). 



10 



Fruit Notes, Volume 67, Fall, 2002 



