504 



THE FUNGI WHICH CAUSE PLANT DISEASE 



This is a conidial form of Leptosphseria coniothyrium. See 

 p. 257.*^^ 



The same fungus was reported by Stevens & Hall** and was 

 studied by O'Gara*' and determined by inoculation and cross 

 inoculating, using pure cultures, to be the cause of rose and apple 

 canker and apple fruit rot. 



C. diplodiella (Speg.) Sacc.^^ 



Pycnidia minute, subcuticular, erumpent, brown, 100-150 ft; 

 conidia ovoid to elliptic, 7-11 x 5.5 m; conidiophores simple or 

 branched, hyaline, fihform. 



This is the cause of a v/hite rot of grapes and has been reported 



Fig. 349. — C. diplodiella, section through 

 pycnidium. After Scribner. 



by Viali & Ravez as belonging to the ascigerous genus Carrinia.™ 

 See p. 263. 



Though probably of American origin it was first recognized 

 in Italy in 1878. In. 1887 it caused alarm in France and it was 

 first noted in America in the same year. The mycelium is abundant 

 in the affected pulp and sometimes upon the seeds. Peduncles 

 are often killed. The pycnidia are subcuticular, first pink, then 

 white, later browTi. 



C. scabrum McA. is the cause of black scurf of citrous fruit 

 in Australia. 



C. coffeae Zimm. is on coffee in Java. 



C. vagabundum Sacc. causes premature fall of leaves of goose- 

 berries. 



C. japonicum Miy., C. brevisporum Miy. and C. anomale 

 Miy. are found on rice in Japan.'* 



