-8- 



delivering impinging droplets to the top center o£ the trees. 

 Analysis of droplet deposition in the bottom center of the trees 

 suggests that the electrostatic charger played a positive role in 

 dye deposition at this site. 



Table 2. Due deposition on leaves sampled from different sections 

 of the tree. 



Low-volume spray Dilute spray 



electrostatic 

 with without 



May 4 Dye deposit rating (0 = no coverage; 5 = heavy coverage 



Delicious, height 8 ft . 



Top center 3.0ab^ 2.3a 3.3b 



Bottom center 3.1a 2.8a 2.4a 



Within row 2.9a 3.2a 3.0a 



Alley 2.9a 2.7a 2.9a 



Cortland, height 17 ft . 



Top center 3.2b 1.4a 2.8b 



Bottom center 3.1b 1.5a 3.3b 



Within row 2.2a 3. lab 3.4b 



Alley 2.8a 2.2a 3.1a 



July 2 8 



Delicious, height 8 ft . 



Top center 3.0a 2.8a 3.0a 



Bottom center 2.8a 2.4a 3.1a 



Within row 3.9a 2.9a 3.8a 



Alley 4.1a 3.6a 4.2a 



Cortland, height 17 ft . 



Top center 2.5a 2.6a 4.4b 



Bottom center 3.0b 1.8a 3.2b 



Within row 2.8a 2.9a 3.3a 



Alley 3.9a 3.6a 3.9a 



z 



Within a row ( — * ) ratings followed by a different letter are signi- 

 ficantly different at odds of 10 to 1 (Lehman-Hodges test) . 



Discussion 



One should be careful in formulating general conclusions from 

 a study such as this. One problem is that an interaction between 

 sprayer performance, tree phenology, and weather conditions exists. 

 As a result, it is difficult to evaluate the impact of these factors 

 when formulating general guidelines for selection of appropriate 

 sprayer type. 



