Third-level, High Tree Density 



2 ^ — -^ 



1997 



12-Aug 2-Sep 

 1999 



First-level, Low Tree Density 



^: 4 



12-Aug 



2Sep 



1997 1998 



-1999 



Figure 1. In 1997, 1998, and 1999, abundance to T^pjr/ mite predators on center trees of third-IevellPM blocks 

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

 which no releases of T pyn were made). 



Fruit Notes, Volume 65, 2000 



