Table 1. Abundance of T. pyri mite predators on leaves sampled in July, August, and September 

 in 1997 from first-level and third-level IPM blocks. T. pyri were released on the center tree in 

 each block in mid-May 1997. 



Mean no. per leaf ' 



Sample time 



Tree size Sample site 



First-level 1PM Third-level IPM 



Late July 



Mid-August 



Large 



Medium 



Small 



Large 



Medium 



Small 



Early September Large 



Medium 



Small 



* For each size of tree at each time of sampling, numbers followed by a different letter are 

 significantly different at odds of 19:1. 



Fruit Notes, Volume 62 (Number 4), Fall, 1997 



11 



