512 THE FUNGI WHICH CAUSE PLANT DISEASE , 



This is responsible for a com mold similar to that caused by 

 the last species.^"* 



Other parasitic species are : 



D. oryzae Miy. on rice; 



D. cerasorum Fcl. on cherries; 



D. aurantii Catt. on oranges; 



D. mori West, on Morus; 



D. gongrogena Temme on Populus in Germany; 



D. sapinea (Fr.) Fcl. on conifers; 



D. pinea Kick, on pine leaves in Europe; 



D. coffeicola Zimm. on coffee; 



D. perseana Del. on the avocado. 



D. opuntise Sacc. is sometimes a serious pest of the cactus. 



D. citricola McA. occurs in Australia on lemon twigs, stems 

 and green fruit.^"* 



D. destruens McA. is on orange and lemon leaves in Australia; ""* 



D. heteroclita D. «Se M. on Citrus in Algiers.^"* 



D. cacaoicola Hen. does much injury to cacao and sugar 

 cane "" in the West Indies. 



D. natalensis Ev. causes a serious black rot of citrus fruits in the 

 Transvaal; "« 



Pycnidia scattered, covered, later erumpent, black; papillate 

 150-180 n; spores elliptical, 1-septate, not constricted, dark, 24 

 X 15 n, exospore with striated bands. 



A Diplodia which cannot be distinguished from this was studied 

 by Fawcett and Burger and is reported as the cause of gum- 

 mosis of peach and orange in Morida.^^' Pure culture inoculations 

 and cross inoculation showed the same fimgus able to cause the 

 disease on both hosts. 



D. rapax Mas. is the cause of a stem disease of Para rubber. 



D. epicocos Cke. grows on the coconut and an imdetermined 

 species attacks ripe pineapples. 



Diplodiella Karsten (p. 510) 



Pycnidia superficial, globose, ostiolate papillate, black, smooth, 

 rather carbonous; conidia elliptic. 

 About twenty-five species, chiefly saprophjrtes on wood. 

 D. oryzae Miy. is found on rice." 



