Third-level. Low Tree Density 



12-Aug 



■ - 1997 



1998 



Third-level, High Tree Density 



■1999 



12-Aug 



- 1997 



1998 



-1999 



First-level. Low Tree Density 



« 0.6 

 1. 



I 



1-Jul 



12-Aug 



1997 



1998 



-1999 



2-Sep 



~1 



Figure 3. In 1997, 1998, and 1999, abundance to T pyri mite predators on center trees of outer rows of third- 

 level IPM blocks (in which T. pyri were released on center trees in mid-May 1997) and center trees of outer rows 

 of first-level IPM blocks (in which no releases of T. pyri were made). 



Fruit Notes, Volume 65, 2000 



