45.0 -r 



-O- 



— flat, fng. 

 ' sloped, fng. 

 steep, fng. 

 • flat, no fng. 



■ sloped, no fng. 



■ steep, no fng. 



Figure 3. Effects of slope within orchards on flyspeck incidence for fungicide-treated (fng.) and 

 non-treated (no fng.) blocks. 



- 50 m, fng. 

 50-90 m.fng. 



> 90 m, fng. 



- 50 m, no fng. 

 50 -90 m, no fng. 



> 90 m, no fng. 



Figure 4. 

 (fng.) and 



Effects of distance to inoculum in borders on flyspeck incidence for fungicide-treated 

 non-treated (no fng.) trees. 



blackberry cane density was slight. 



The steeper the slope in a block, the less fly- 

 speck incidence (Figure 3). This factor may be re- 

 lated to air drainage or air circulation. Applying 

 fungicides erased the slope effect. 



As hypothesized, the closer a block was to the 

 border inoculum, the higher the flyspeck incidence 



(Figure 4). We also looked at this distance effect in 

 a different set of plots. Cooperating growers also 

 were asked to leave a strip of trees unsprayed dur- 

 ing the summer. The strips extended from the bor- 

 ders of a blocks to the interiors over a distance of 

 approximately 80 meters. At approximately weekly 

 intervals from late July into September, trees in 



Fruit Notes, Spring, 1996 



