10 days. 



We have tested Flint for the last two years in scab 

 trials, and looked at Sovran in a flyspeck trial this past 

 year. In addition, several other researchers have run 

 tests of one or both of these fungicides in recent years. 

 We show some of the results of our trials here. The 

 scab trials were done at the Horticultural Research 

 Center in Belchertown, with an airblast sprayer. The 

 fungicides were applied on schedules that would nor- 

 mally be used in a growers orchard. However, the 

 manufacturer of Flint wanted to include another new 

 fungicide, Vangard (cyprodonil) in the tests. Vangard 

 represents another new class of fungicide chemistry, 

 but appears to be of limited value to apple growers. 



In Table 1 includes 1998 results. It shows that the 

 Flint treatment performed as well as standard Rubigan 

 or Nova plus Dithane treatments against fruit and fo- 

 liar scab. While the percentages were slightly differ- 

 ent, the differences were not significant. By compari- 

 son, a low rate of Dithane (1 lb. / 100 gal.) did a rela- 

 tively poor job of controlling early foliar scab. How- 



ever, by the end of the summer, following three appli- 

 cations of captan on all treatments, fruit in the Dithane 

 treatment were comparable to those in the other fungi- 

 cide treatments. 



In the 1998 test (Table 2), Vangard performed well 

 when used in combination with the strobilurine. How- 

 ever, the 1999 test suggested that Vangard may not be 

 carrying much of the load in RintA'angard combina- 

 tions. While the differences generally were not sig- 

 nificant, there was no scab where Flint was used alone, 

 but 4 to 5 % foliar scab in treatments where Vangard 

 was used in the early season. Scab on fruit at harvest 

 was similar. While this test is not conclusive, data 

 from the Hudson Valley Lab (Rosenbergeret al., 1998) 

 showed clearly that Vangard did not control scab as 

 well as Flint when both were used on a 10-day spray 

 interval during the exceptionally wet 1998 season. 

 (Table 3). 



Tests for flyspeck control in Belchertown have 

 been less conclusive. This year, the dry weather and 

 the low inoculum in Belchertown made it unlikely that 



Fruit Notes, Volume 64 (Number 2), Spring, 1999 



