Third-level, Low Tree Density 



1997 



■1998 



-1999 



Third-level. Medium Tree Density 



1997 



1998 



-1999 



Third-level, High Tree Density 



1997 



1998 



First-level, Low Tree Den sity 



12-Aug 



2-Sep 



1997 



1998 



-1999 



First-level, Medium Tree Density 



« 0.6 



i 



= 0.4 



12-Aug 



2-Sep 



1997 



1998 



First-level, High Tree Den srty 



12-A09 



1997 



1998 



-1999 



Figure 6. In 1997, 1998, and 1999, abundance to y4./a//<7CK niite predators on center trees of outer rows of third- 

 level IPM blocks (in which 7" pyri were released on center trees in mid-May 1997) and center trees of outer rows 

 of first-level 1PM blocks (in which no releases of T. pyri were made). 



12 



Fruit Notes. Volume 65. 2000 



