Flyspeck Disease Management: 

 Comparison of Flint versus Captan 

 in Every-row versus Perimeter-row 

 Sprays 



Andrew Baj, Arthur Tuttle, and Dan Cooley 

 Department of Microbiology, University of Massachusetts 



In 2001, we began a 4-year study to evaluate new This study seeks to determine if the strategy of 



pesticides (in this case, the environmentally benign spraying only the two perimeter-rows in blocks of apple 



fungicide, Flint, for flyspeck disease) for apple pests trees during the summer months is adequate to man- 



and a pesticide-reduction strategy (spraying only the age the disease at six orchards in Massachusetts. If 



two rows of apple trees on the perimeter of the block), proven efficacious, this strategy could help offset high 



Flyspeck (FS) disease, like apple maggot fly and plum costs of new materials and help reduce the pesticide 



curculio, survives the winter on or in plant material in load on the environment, 

 the wooded or hedgerow borders and often infests an 



orchard block with a significant disease gradient which Materials & Methods 

 decreases with distance into the block (Cooley, 1996). 



The 2001 insect pest management results of the study The experiment took place in blocks of apple trees 



were reported in Fruit Notes 66:14-18. at orchards in six Massachusetts towns: Harvard, Ber- 



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Border area Border area Border area Border area 



Flint (2.0 oz./acre) Captan 80 (2.5 Ib./acre) Flint (2.0 oz./acre) Captan 80 (2.5 Ib./acre) 



4- + + + -1^ + + + -H -I- -I- 4- -I- -I- -I- + -I- + + + + + + + -I- + + + -I- -I- -I- -I- -I- -t- -I- -I- 



+ + + + + + + + + + + + + + + -I- 4--I- -I--I- + + + + + + + + + + + + + + + + 



+ + + + + + + -(-+ + + + + + + + + + 



-I- + -1- -t- -I- + -t- + + -I- + + -(- + + -I- -1- -H 



-I- -I- -I- -I- -I- -I- -I- -I- -I- + + + + + -1- 4- + + 



-I- + -I- -I- -I- -I- -(- -I- -I- + + + + + + + + + 



-I- -I- -I- + -I- 4- + + -I- + + + + + + + + + 



Key: + = sprayed tree, — = unsprayed tree, X = trees, shrubs, and vines 



Figure 1 . An example of a perimeter-row spray block with fungicide rates in six Massachusetts apple 

 orchards, 2001. 



Fruit Notes, Volume 67, Spring, 2002 



