amount of dye per leaf was estimated by a single index rating 

 made visually under a 15 watt ultra-violet lamp (Table 1) . 



Table 1. Rating system for evaluating deposition of fluorescent 

 dye on apple leaves. 



Amount of dye 



Value assigned 



Typical appearance 



None 



Trace 



Light 



Medium 



Heavy 



Very heavy 







3 



4 



LeaA'^es from 6 positions in the tree canopy (top center, bottom 

 center, north, south, east, and west peripheries) were rated 

 separately for initial analysis of droplet distribution and were 

 later pooled into four positions (top center, bottom center, 

 alley periphery, and within row periphery) for subsequent analysis 



Results 



The dye deposition on 

 the sprayers was similar ex 

 where the low-volume spraye 

 did not provide as heavy a 

 However, differences in dye 

 the tall Cortland trees. L 

 of these trees after being 

 dye deposits when the elect 

 than when not used (Table 2 

 a more evenly distributed c 

 either of the low-volume me 



May 4 in the small Delicio 

 cept in the top center of 

 r without the electrostati 

 coverage as the dilute spr 

 distribution were more di 

 eaves from top center and 

 sprayed with the Kinkelder 

 rostatic charger unit was 

 ) . The dilute sprayer app 

 overage throughout the tal 

 thods . 



us trees by 

 the trees 

 c charger 

 ayer (Table 2) 

 scernible in 

 bottom center 



had heavier 

 in operation 

 eared to apply 

 1 trees than 



The results of the July 28th trial indicate no discernible 

 differences in dye deposition on small trees due to sprayer type. 

 Such was not the case, however, in the Cortland trees. Here, the 

 dilute sprayer proved far superior to the low-volume sprayer in 



