substantially less than that on Glohaven. These 

 differences most likely reflect the timing of 

 activity of each of these two insect pests rela- 

 tive to the timing of fruit development of the 

 two cultivars and the last insecticide spray. 



The four treatment regimes resulted in 

 similar levels of stink bug damage on Redhaven 

 and Glohaven fruit(Tables 2 and 3). Because 

 these were 3-tree plots, with different treat- 

 ments applied to adjacent trees, it is possible 

 that spray drift could account for at least some 

 of the lack of effect. Timing of insecticide ap- 

 plications could have affected results as well. 



Redhaven fruit under the reduced-spray 

 regime had the greatest amount of Japanese 

 beetle feeding, and those under the other treat- 

 ments were similar (Table 2). Likewise, 

 Glohaven fruit under the reduced-spray treat- 

 ment had the most damage, but for Glohaven, 

 the no-spray treatment had significantly less 

 damage (Table 3). It is unclear why these re- 

 sults occurred. It is likely, however, that real differ- 

 ences did not occur in this experiment. High mean 



Table 2. Insect damage to Redhaven peaches under 

 different pesticide treatment schedules. Fruit were 

 harvested on August 15 and 21. Each treatment 

 included three trees in each of three replications. For 

 assessment, 100 peaches were harvested from each 

 tree. '- 



'Means within columns not followed by the same 

 letter are significant at odds of 15:1. 



values were likely the result of very localized infesta- 

 tions of Japanese beetles. 



14 



Fruit Notes, Volume 63 (Number 2), Spring, 1998 



