THE QUli^CE EUST 



49 



nourishment for fruit production. Three applications 

 were made, the first May 11, the second May 28, and 

 the third June 22. Two sprayed rows yielded seventy- 

 one and one-half baskets of marketable fruit, while five 

 untreated rows yielded one basket of marketable fruit. 

 "Comparing the yield from the untreated rows, and 

 estimatiug it at one-third basket per row, which is more 

 than was actually obtained, the net income from a single 

 treated row was one hundred times as great as from an 

 untreated row." 



The Quince Rust 



Roestelia aurantiaca 



Young quinces are sometimes disfigured by the 

 presence of a rust fungus, in the peculiar way repre- 



sentefl in Fig. 24. On some por- 

 tion of the distorted surface orange 

 spots eventually appear ; they are 

 usually more or less elevated. From 

 them the spores of the fungus are 

 produced in immense numbers, to 

 be borne hither and thither by the 

 wind. A peculiar fact concerning 

 these spores is that they do not de- 

 velop on the leaves and fruit of 

 other quinces, but, instead, are 

 only able to develop upon the 

 branches of red cedar and low jun- 

 iper. Those spores ^vhich are 

 blown to these plants under favor- 

 able conditions, produce on them the "cedar balls," or 

 "cedar apples," so often noticed. One of these is repre- 

 sented in Fig. 25. On the cedar or juniper other spores 

 are produced, for the wind to carry back to quince to 

 start the rust again. Thus there is constantly what is 



FIG. 25. CEDAR BALL. 



