58 NEBRASKA STATE HORTICULTURAL SOCIETY. 



spraying including the same varieties, followed on May 7 

 and 9, about twelve days after the first, when the apple 

 flowers were beginning to open. The rainy weather of about 

 this time had caused the cedar apples to enlarge rapidly and to 

 assume the characteristic orange color and gelatinous character. 

 The third spraying came sixteen days after the second, or May 

 23, in case of Johathan and Ralls Genet, and nineteen days after 

 the second spraying, May 28, for the Wealthy and Sweet June. 

 Maiden Blush and Winesap trees were now sprayed for the first 

 and only time. May 23 for the former and May 27 for the latter. 

 At the time of this last spraying the blossoms had fallen from 

 most varieties of apple. No trace of scab was yet seen. The 

 cedar apple were apparently still in a condition to give off rust 

 spores. No rust was visible on either the sprayed or unsprayed 

 Wealthy or Jonathan trees, though rust spots were showing 

 plainly on the leaves of the prairie crab and prairie hj^brids in 

 the same vicinity. 



To determine the amount of cedar rust on sprayed and un- 

 sprayed trees, one-hundred leaves were picked at random from 

 various trees and afterwards examined for rust spots, the num- 

 ber of rusted leaves and the total number of rust spots being 

 noted. This was done in the latter part of July. The preval- 

 ence of scab on the sprayed and unsprayed trees was determined 

 approximately at about the same time by simply examining from 

 one-hundred to two-hundred fruits per tree. Later when the 

 apples were picked, all the fruits except in case of Jonathan- 

 were examined and the amount of scab on different trees deter- 

 mined more accurately. The fruits were put into two classes, 

 "scabby" and "not scabby," the former if they had any large 

 spots of scab or several small ones, the latter if they were free 

 from scab or showed only a few small spots of it. 



RESUT.TS OF SPRAYING FOR RUST. 



The results of the season's work against cedar rust on apple 

 trees are given in the following table: 



