40.0 T 



Week 



Figure 2. Flyspeck incidence as over all blocks for various bramble densities for fungicide- treated 

 (fng.) and non-treated (no fng.) trees. The bramble densities were rated along the border near- 

 est the test area, and A = no to a few scattered canes; B = few canes in scattered patches; C - 

 line of canes along border edge; D = solid area of canes. 



Table 1. 

 chards. 



Difference in flyspeck incidence in different or 



uted to flyspeck incidence in these blocks: the rela- 

 tive altitude of the block within the orchard, the 

 amount of slope in the block, the distance to the 

 border, and inoculum density on the border 

 brambles. The rela- 

 tive altitude in the 

 orchard proved to be 

 a surprisingly impor- 

 tant factor. The test 

 blocks in the lower 

 parts of orchards had 

 significantly more fly- 

 speck than the blocks 

 which were at the 

 higher parts of the or- 



chard (Figure 1). This could relate 

 to factors such as wind which would 

 encourage more rapid drying in 

 blocks which were higher up. The 

 relative altitude of the trees made 

 only a slight difference when fungi- 

 cides were applied. 



The density of the blackberry 

 canes in the orchard border also af- 

 fected flyspeck incidence. As the 

 bramble density increased, so did fly- 

 speck incidence (Figure 2). This may 

 be related to increased inoculum supplied by fly- 

 speck on the canes, or it may simply be an indicator 

 of dense border areas with less air circulation. 

 Again, if fungicides were used, the effect of the 



Fruit Notes, Spring, 1996 



