33° 



FUNGOUS DISEASES OF PLANTS 



XXXI. COLLETOTRICHUM: OTHER SPECIES 



Among numerous other species of economic importance the 

 following may be mentioned. 



Colletotrichum Lagenarium (Pass.) Ell. & Hals. The anthrac- 

 nose of cucumbers, squash, watermelons, etc., is a disease of both 

 leaves and fruit. On the former brown spots are produced, causing 

 early maturity of the leaf ; but the more serious form of the 

 trouble is on the fruit, where water-soaked, finally sunken spots 

 are developed. In these spots appear acervuli producing numerous 

 conidia adhering in the form of viscid masses pink in color. A 

 mold-like growth of superficial hyphae may also appear in moist 

 weather. In time the whole fruit may rot, saprophytic organisms 

 assisting. 



Colletotriclium falcatum Sacc. is believed to be the chief cause 

 of the red rot 1 of sugar cane {Saccharum officinarum) in the 

 East Indies and in the Hawaiian Islands. 



Colletotrichum Phomoides (Sacc.) Chester 2 is the cause of a 

 disease of the tomato fruit characterized by discolored, sunken 

 spots. Under moist conditions these spread quickly, become con- 

 fluent, and there is produced a general decay. At first distinct 

 acervuli are produced, but with the softening of the tissues a con- 

 tinuous stratum of conidiophores and setae may arise. This is re- 

 garded as wholly distinct from a species on peppers, Colletotrichum 

 nigrum Ell. & Halsted, described a few years earlier. 



XXXII. GLCEOSPORIUM 



The genus Glceosporium has been discussed in part, inas- 

 much as several species of this form genus have been definitely 

 connected with several genera of Ascomycetes already treated. 

 Specific names have been assigned to forms of this genus on 

 several hundred host plants. Many of these are fungi of great 

 economic importance. They are parasites whose attacks frequently 

 amount to epidemics. Nevertheless, these fungi are grown in 

 artificial cultures, as a rule, with the greatest readiness. Moreover, 



1 Lewton-Brain, L. Red Rot of the Sugar Cane Stem. Exp. Sta. of the 

 Hawaiian Sugar Planters Assoc. Built. 8 : 1-44. figs. i-ij. 1908. 



2 Chester, F. D. Diseases of the Tomato and Their Treatment. Del. Agl. Exp. 

 Sta. Rep. 4: 60-62. figs. 8-10. 1891. 



