160 



■ Gab, Fuji, Jonagokd 

 D Mcintosh, Empire 



■ Gala, Fuji, Jonagokd 

 n Mcintosh, Empire 



TRAP CAPTURES 



FRUIT INJURY 



Figure 5. Total captures of PC's on perimeter-row traps and PC injury to perimeter-row fruit in six 

 blocks of apple trees comprised of Gala, Fuji, or Jonagold as perimeter-row cultivars versus six blocks 

 comprised of Mcintosh or Empire as perimeter-row cultivars. 



phenology of PC injury is helpful in understanding the 

 lack of relationship between these two entities. As 

 shown in Figure 4, PC captures were greatest during 

 the period of pink to petal fall but were low during 

 each 2-week period thereafter. Conversely, PC injury 

 to fruit was low (about 1 .5%) during the first 2 weeks 

 after petal fall, but increased in essentially a linear 

 fashion until 4 to 6 weeks after petal fall, when it 

 reached about 5.3%. Thus, the trends depicted in Figure 



4 show clearly that the steady rise in PC fruit injury on 

 perimeter-row trees from petal fall to 6 weeks thereafter 

 was not accompanied by a rise in PC captures by 

 perimeter-row Circle traps baited with benzaldehyde 

 plus GA, accounting for the lack of correlation between 

 these variables. 



Figure 5 shows that PC captures by all perimeter- 

 row traps combined and PC injury to perimeter-row 

 fruit were about 60% and 140% greater, respectively, 



20 



Fruit Notes, Volume 67, Winter, 2002 



