Quince. 



353 



FUNGOUS DISEASES. 



QUINCE. 



Black Rot (Sphceropsis Malorum, Peck). Description. Apples 

 and pears, as well as quinces, suffer from the fungus which 

 causes black rot. The fruit is generally not attacked until it is 

 at least one-half grown. 

 Infection takes place, as 

 a rule, at the blossom 

 end. A small brown 

 spot appears upon the 

 surface, and as it in- 

 creases in size dark pim- 

 ples appear upon the 

 part first affected. Later 

 the fruit cracks, and 

 spores are freely dis- 

 tributed. The diseased 

 quinces frequently re- 

 main hanging on the 

 trees throughout the 

 winter, and serve as ex- 

 cellent sources of infec- 

 tion. 



Treatment. As the 

 malady appears late in 

 the season, the applica- 

 tion of the Bordeaux 

 mixture can scarcely be 

 recommended. Clear 

 fungicides should be used, and, if thoroughly applied, the dis- 

 ease, which, as a rule, is not serious, can probably be held in 

 check by two or three treatments. 



Blight. See under PEAK. 



Leaf Blight; Fruit Spot; Leaf Spot (Entomosporium macula- 

 turn, Lev.). Description. Quince foliage is generally affected 

 by the leaf-blight fungus during early summer. Fig. 82 

 represents quince foliage dotted with the small circular spots 

 which are produced by the fungus. These are of a reddish- 

 brown color, and although at first circular in form, when several 

 2 A 



FIG. 82. Quince foliage affected with leaf blight. 



