390 MANUAL OF FRUIT DISEASES 



the foliage, with the difference that twig-lesions on quince are 

 more elongated in form and have a depressed surface. The 

 center of the spot shows the fruiting pustule as described for 

 the leaves. On the fruit a black spot is produced. In milder 

 cases the spots are scattered and the effects are not serious ; in 

 more intensive attacks the fruits become cracked and lop-sided. 

 The cause of the disease, as in the case of pear leaf-blight, is 

 the fungus Fabrcea maculata. For its control see discussion 

 under Pear, page 349. 



REFERENCES 



Stewart, V. B. Some important leaf diseases of nursery stock. Cor- 

 nell Univ. Agr. Exp. Sta. Bui. 358 : 171-224. 1915. 



Bailey, L. H. The quince in western New York. Leaf-blight and 

 fruit-spot. Cornell Univ. Agr. Exp. Sta. Bui. 80 : 619-625. 

 1894. 



Halsted, B. D. Some fungous diseases of the quince. The quince 

 fruit spot. New Jersey Agr. Exp. Sta. Bui. 91 : 6-8. 1892. 



Arthur, J. C. Spotting of quince fruit. New York (Geneva) Agr. 

 Exp. Kept. 4 : 275-276. 1886. 



Thaxter, R. Leaf-spot of quince. Connecticut Agr. Exp. Sta. Rept. 

 1890:99-100. 1891. 



See additional references under Pear, page 350. 



RUST 



Caused by Gymnosporangium davipes Cooke and Peck 



Although the damage done by quince-rust is not of great 

 extent, nevertheless the disease has a general prevalence in the 

 region from New England west to northern Michigan, and 

 south to Florida. Outbreaks have been known in Massachu- 

 setts in 1897, in western New York in 1910, and the trouble is 

 commonly observed in Alabama, South Carolina, North Caro- 

 lina, New York, Pennsylvania, New Jersey and Iowa. 

 Generally speaking, quince-rust is not common in the 

 Mississippi Valley. Affected fruits are usually worthless 

 and rusted twigs are considerably malformed. 



