Results 



2001 Field study. Table 1 shows that within the 

 first 10 days after spraying, unsprayed traps 

 (particularly pyramids) captured more PCs than 

 sprayed traps. From 11 to 20 days after insecticide 

 application, all traps captured similar numbers of PCs. 



Only one PC was captured after 20 days (by a sprayed 

 cylinder trap). Overall, at least twice as many PCs were 

 captured by unsprayed small pyramid traps than by any 

 other trap type. 



Figure 2 depicts, for the first 10 days after 

 insecticide application, the degree of correlation 

 between the extent of PC captures by a trap and the 



5 



H 



5 



H 



5 



14 

 12 

 10 

 8 

 6 

 4 

 2 







14 - 

 12 - 

 10 - 



8 - 

 6 - 

 4 - 



2 - 

 - 



0-10 DAYS AFTER SPRAY 



SPRAYED 



UNSPRAYED 



11-20 DAYS AFTER SPRAY 



■ Trap-bearing tree 

 □ Adjacent trees 



SPRAYED 



UNSPRAYED 



> 21 DAYS AFTER SPRAY 



■ Trap-bearing tree 

 D Adjacent trees 



SPRAYED 



UNSPRAYED 



Figure 3. Amount of fruit injured by PCs on perimeter-row apple trees having a trap (i.e., trap-bearing 

 tree) or on two adjacent non-trapped trees (adjacent trees). Data combined for pyramid and cylinder 

 traps (2001 field study). 



Fruit Notes, Volume 67, Fall, 2002 



