in row 1. By 2002 and 2003, however, T. pyh were 

 equally abundant in rows 1 , 4 and 7. A. fallacis showed 

 no clear pattern in abundance according to row across 

 2001, 2002 and 2003 . The same was true for European 

 red mites. 



Our third question focused on the potential value 

 of establishing American hazel trees in border areas as 

 a way of promoting buildup of predatory mites and 

 enhancing populations of predators in adjacent blocks 

 of orchard trees. However, as shown in Fig. 3 for the 



four orchard blocks involved in this evaluation, the 

 abundance of T. pyri and especially A. fallacis was low 

 on leaves of American hazel trees in border areas. 

 Moreover, neither of these predators was more 

 abundant in row 1 trees than in row 4 or row 7 trees, 

 which could have been expected if substantial numbers 

 of predators were moving from American hazel trees 

 toward orchard blocks. 



Our fourth question concerned the relationship 

 between T. pyri and A. fallacis. Data from our study of 



Fruit Notes, Volume 68, Spring, Summer, & Fall, 2003 



