THE QUiXCE KLST 



40 



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 

 estimating 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- 



senterl in Fig. 24. On some per- 

 son 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- 

 ipei*. Those spores which are 

 blown to these plants under favor- 

 able conditions, j^roduce 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 as^ain. Thus there is constantly what is 



FKJ. 25. CEDAR BALL. 



