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 Fabrea 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. Bul. 358: 171-224. 1915. 
Bailey, L. H. The quince in western New York. Leaf-blight and 
fruit-spot. Cornell Univ. Agr. Exp. Sta. Bul. 80: 619-625. 
1894. 
Halsted, B. D. Some fungous diseases of the quince. The quince 
fruit spot. New Jersey Agr. Exp. Sta. Bul. 91:6-8. 1892. 
Arthur, J. C. Spotting of quince fruit. New York (Geneva) Agr. 
Exp. Rept. 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 clavipes 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 _ lJowa. 
Generally speaking, quince-rust is not common in the 
Mississippi Valley. Affected fruits are usually worthless 
and rusted twigs are considerably malformed. 
