ASCOMYCETES 263 



hibernation is supposed to be effected in some cases by means 

 of the tuberculate stromata, which retain their vitality and serve as 

 minute sclerotia, germinating the following spring. The asci 

 average 40 /u, long, and the spores 

 measure about 1 5 X 3-4 fi. 



Control. Healthy plants only 

 should be set, and all spotted 

 leaves should be pinched off. 

 A thorough spraying with Bor- a b 



deaux mixture may be given FlG - "5- Mycosphmrella Fragar/^e, 

 before the flowers areppen, when CoNIDIAL AND Ascigerous Stages 

 necessary. If the disease is serious or disastrous late in the season, 

 its reappearance the next year may be delayed and to some extent 

 averted by mowing off the leaves and burning over the bed. 



XLIII. LEAF-SPLITTING BLIGHT OF SUGAR CANE 



Mycospharella stratiformans Cobb 



Cobb, N. A. Fungous Maladies of the Sugar Cane. III. Leaf-Splitting 

 Blight. Hawaiian Sugar Planters Exp. Sta. Built. 5 : 93-106. 1906. 



This is the name provisionally applied to a fungus which 

 causes a peculiar leaf-splitting of sugar cane in portions of the 

 Hawaiian Islands. The leaves are split, and in severe cases 

 reduced to shreds. The ascogenous stage alone has been re- 

 ported. The perithecia are produced abundantly. Diseased stalks 

 should not be planted, and all leaf trash from an affected field 

 should be destroyed. What appear to be related species of fungi 

 have been described as injurious to cane in Java and in La Plata, 

 Argentina. 



Mycosphaerella Cerasella Aderh. 1 is considered to be the ascog- 

 enous form of Cercospora Cerasella Sacc, well known upon the 

 leaves of cherry, sometimes producing a shot hole effect similar 

 to that which may follow any leaf spot fungus parasitic upon 

 species of Prunus. 



1 Aderhold, R. Mycosphaerella cerasella n. spec, die Perithecienform von 

 Cercospora cerasella Sacc, und ihre Entwicklung. Ber. d. deut. bot. Ges. 18 : 

 246-249. 1 goo. 



