AM, summer LR, and internal Lepidoptera. Further, 

 combined data for both years indicate that applying 

 Guthion only to perimeter-row trees from the first cover 

 spray onward was just as effective in protecting interior 

 rows agamst injury by PC and AM as applying Guthion 

 to all trees in a block from the first cover spray onward. 

 In the case of Avaunt, however, all-row sprays were 

 numerically (though not statistically) superior to 

 perimeter-row sprays in providing protection against 

 injury by PC and AM on interior rows. 



We conclude that Avaunt can be an effective 

 substitute for Guthion against PC, AM, summer LR, 



and internal Lepidoptera when applied to all trees in 

 an orchard but may be less effective than Guthion in 

 providing orchard-wide control of PC and AM if 

 applied only to perimeter-row trees. 



A ckn o wledgem ents 



We thank the five cooperating growers: Gerry 

 Beime, Aaron Clark, Don Green, Tony Lincoln, and 

 Bob Tuttle. This work was supported by a grant from 

 the USDA CSREES Crops at Risk Program and a grant 

 from DuPont Corporation. 



it it it it it 



Fruit Notes, Volume 68, Winter, 2003 



