we would get flyspeck. Therefore, we did a single- 

 application test in a block of Liberty trees at the Uni- 

 versity of Rhode Island East Farm in Kingston. By the 

 time the application was made on July 29, flyspeck 

 was already evident in the test block. Test trees re- 

 ceived no fungicides for the season except for the ap- 

 plication that was part of this test. Flint and Sovran 

 were compared to Benlate plus captan and to calcium 

 chloride. The results are shown in Table 4 and Figure 

 1. 



Strobilurines 

 performed as well as 

 or better than the 

 best standard treat- 

 ment, Benlate plus 

 Captan, in a single 

 application. The dif- 

 ference between 

 Flint and Sovran 

 may be due to a rate 

 effect, as it has been 

 suggested that 

 Sovran should be 

 used at twice the 

 Flint rate for equiva- 

 lent activity. The 



single application of calcium chloride did not signifi- 

 cantly reduce flyspeck at harvest, but did appear to 

 slow the epidemic. It also appears that the effect of 

 the strobilurines lasted for approximately 3 weeks, at 

 which point the rate of flyspeck-symptom appearance 

 in both strobilurine treatments and the Benlate/captan 

 treatment were similar. The early effect meant that at 

 harvest, Flint was still significantly better than Benlate/ 

 captan in terms of flyspeck control. 



Table 4. Flyspeck severity in apples treated with a single fungicide application on 

 July 29, 1999, Kingston, RI. 



Treatment 



Flyspeck* 



Check 2.73 a 



Calcium chloride 80% 10 lbs. / acre 2.46 a 



Benlate 50 WP 9 oz. / acre plus captan 50W 3 lbs. / acre 1 .64 b 



Sovran 3.2 oz. /acre 1.41 be 



Flint 2 oz. /acre 1.14 c 



♦Rating for each fruit: O^clean; 1=<10%; 2=10-40%; 3=>40%, 

 followed by the same letter are significantly different at odds of 19 to 1. 



Means not 



10 



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



