Third-level, Low Tree Density 



~^ ^-_ 



~r V" 



lI 



1997 



■1998 



-1999 



Third-level, Medium Tree Density 



12-Aug 



-1997 1998 



-1999 



Third-level, High Tree Density 



12-Auo 



1997 1998 



-1999 



First-level, Low Tree Den sity 



- - 1997 



1998 



-1999 



First-level, Medium Tree Density 



- 1997 1998 



Figure 8. In 1997, 1998, and 1999, abundance to European red mites (ERM) on outer trees of center row of third- 

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

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



14 



Fruit Notes, Volume 65. 2000 



