Porto Rico.— On cane, Yabueoa, Mareh 27, 1911, 4040 ; Rio Pie- 

 dras, April, 1911, 4052, 4056, June 5, 1911, 4066, Feb. 10, 1912, 

 4211, March 25, 1911, 4295, April 14, 1912, 4340 ; Fortuna, April 27, 

 1912, 4356; Jan. 10, 1912, 4152; Aguadilla, April 7, 1916, 5135- 

 Camuy, Jan. 4, 1917, 6074. Very common in all parts of the Island. 

 Observed but not collected at Fajardo, Canovanas, Carolina, Juncos, 

 Arecibo, Barceloneta, Central Alianza, Quebradillas, Utuado, Isabela, 

 Anasco, Guanica, Vega Baja, Toa Baja, Bayamon. (PI. XX, fig. 3; 

 pi. XXXI, fig. 7.) 



CYTOSPORA SACCHARI. 



This is a comparatively new disease of cane for which no common 

 name has as yet been proposed. It was first found in February, 1912, 

 by the senior author on dead cuttings of various Barbados seedlings 

 at Rio Piedras. In succeeding months it was noted on dead stalks 

 of other varieties of the same origen, and in 1913 was discovered 

 at Fajardo, again on Barbados seedlings. In this instance, it was 

 causing some loss. Still later investigations were made in this 

 locality, the disease having spread to other varieties and occasioned 

 some alarm. The only other locality in which the fungus has been 

 seen to date is Carolina where in 1914 a small infected area in rayada 

 (striped) cane Avas observed. The varieties which have suffered 

 injury have been the softer white canes and for the most part intro- 

 duced varieties. It would appear that the disease had been brought 

 in on some one of these prior to the establishing of the plant quar- 

 antine. 



The following varieties have been found infected to date, Rayada, 

 B-71G9, B-6385, B-1753, B-8660, B-7245. B-3696, B-3859, B-1355, 

 B-3922. D-109. D-117. G. C.-759. and G. C.-47. Of tliese B-3922 

 and R-3696 liave been most severely attacked. 



Th(- first report of the occurrence of Cytospora is from British 

 India. Butler (10) who originally described the fungus stated that 

 "on one stool examined the stem, at one of the upper internodes was 

 affected and the fungus was present on the leaf-sheaths as \vell." 

 For tbe most part, however, it was merely a saprophyte. Averna- 

 Sacca (100) has recently given an account of a disease which he 

 ascril)es to this same fungus, occurring in the State of Sao Paulo, 

 Brazil. He claims to have found the perfect stage, but without hav- 

 ing made any pure culture studies. His results are considered very 

 doubtful. 



The symptoms of the disease are very marked. Young shoots 

 are killed outright, others checked in their growth, and the lower 



196 



