Conclusions 



The new environmentally benign fungicide, Flint, 

 performed as well or better than the older broad spec- 

 trum fungicide, captan. This finding was supported 

 by similar results in our twelve-block "Orchard Archi- 

 tecture" experiment in which a Flint-captan-Flint three- 

 spray summer program was as effective as a first-Level 

 IPM program. Other work of ours in small plot trials 

 in MA and RI and work reported by Dave Rosenberger 

 in New York indicate Flint and the other new strobilurin 

 fungicide, Sovran, are quite effective against FS and 

 scab. A task for 2002 is to determine the minimum 

 amount strobilurin necessary to control different lev- 

 els of FS infection. 



At two of the sites, the perimeter-rows spray treat- 

 ment worked as well as the seven-row spray treatment. 

 These were sites with relatively low levels of FS in the 

 borders adjacent to the blocks. At the other four sites, 

 there was more FS in the apples in rows 3,5, and 7 of 

 the perimeter-rows spray treatment blocks than in the 

 corresponding rows of the seven-row spray treatment 

 blocks. Among unsprayed rows, row 5 had the most 

 FS, while row 3 had less (presumably due to spray drift 

 from rows 1 and 2), and row 7 had even less than row 

 3. FS showed-up earliest in the site which had the 



highest amount of FS in the border in June (Harvard). 

 For adequate management of FS, blocks with rela- 

 tively high FS levels in the border areas will either 

 require spraying further into a block than row 2 or re- 

 moval or treatment of FS in the borders. We will test 

 these findings further in the second year of the study. 

 We will also attempt to control for spores that might 

 be entering the research blocks from border areas to 

 the sides and rear of the blocks. 



References 



Cooley, D.R. et al. 1996. Orchard site factors related 

 to incidence of FS in apples. Fruit Notes 6\{2): 1-4. 



A ckn o wledgem en ts 



We thank the following cooperating growers for 

 their participation in this study: Jerry Bieme, Dave 

 Bishop, Aaron Clark, Don and Chris Green, Tony Lin- 

 coln, and Bob and Mark Tuttle. We also thank Andy 

 Hamilton for applying post-petal-fall sprays, and Bayer 

 Corporation for supplying the Flint. This study was 

 supported by a grant from the USDA CSREES Crops 

 at Risk Program. 



*%X^ %J> \3^ %S^ 

 ^1^ ^f% ^j% #^ 



Fruit Notes, Volume 67, Spring, 2002 



