ASCOMYCETES 271 



least one more two weeks after the second. The conditions, 

 however, must determine the length of time intervening and the 

 number of applications made. 



XLV. BITTER ROT OF THE APPLE AND OTHER FRUITS 

 Glomerella rufomaculans (Berk.) Spauld. & Von Sch. 



BLAIR, J. C. Bitter Rot of Apples. 111. Agl. Exp. Sta. Built. 117: 483-551. 



1907. 

 BURRILL, T. J. Bitter Rot of Apples. 111. Agl. Exp. Sta. Built. 77 : 351-366. 



//. C. figS. I-I2. 1902. 



BURRILL, T. J. Bitter Rot of Apples. 111. Agl. Exp. Sta. Built. 118 : 554-608. 



1907. 

 CLINTON, G. P. Bitter Rot. 111. Agl. Exp. Sta. Built. 69 : 193-21 1. figs. 1-39. 



1902. 

 CLINTON, G. P. Gnomoniopsis fructigena. 111. Agl. Exp. Sta. Built. 69 : 206- 



211. 1902. 

 EDGERTON, C. W. The Physiology and Development of Some Anthracnoses. 



Bot. Gaz. 45: 367-408. pi. n. figs. 1-17. 1908. 

 HALSTED, B. D. Laboratory Studies of Fruit Decays. N. J. Agl. Exp. Sta. 



Rept. (1892): 326-330. 

 SCHRENK, H. VON, and SPAULDING, P. The Bitter Rot of Apples. U. S. Dept. 



Agl., Bureau of Plant Industry, Built. 44: 1-54. pis. 1-9. 1903. 

 (Consult this paper for more complete bibliography on the bitter rot.) 

 SCOTT, W. M. The Control of Apple Bitter Rot. U. S. Dept. Agl., Bureau 



of Plant Industry, Built. 93: 1-33. pis. 1-8. 1906. 

 STONEMAN, BERTHA. A Comparative Study of Some Anthracnoses. Bot. 



Gaz. 26: 69-120. pis. 7-18. 1898. (Glceosporium fructigenum Berk. 



pp. 71-74. figs. i- 4 , 33 - 3 8, 83.} 



The most destructive apple disease in the chief apple-growing 

 districts of the United States is unquestionably the bitter rot. 

 This disease varies greatly in virulence with the conditions, 

 becoming at times so destructive as practically to annihilate a 

 crop in large areas. Fortunately, it does not appear in great 

 quantity until midsummer, and then if the conditions are un- 

 favorable it may not become a source of serious loss. 



Distribution. The bitter rot fungus is widely distributed in 

 the United States east of and including Kansas, Oklahoma, and 

 Texas. It seems to be particularly destructive in a more or less 

 central area extending from the Atlantic seaboard in Virginia 

 westward to Oklahoma. The fungus, however, is not limited to 

 the United States, and is probably common and more or less 

 injurious in all apple-producing countries. It is certainly known 



