SOOTY MOULD OF ORANGE 103 



Capnodium citricolum, M' Alpine. This fungus, known 

 as ' Black-blight ' in Australia, appears to be widely dis- 

 tributed on living leaves of orange and lemon trees in 

 the last-named country. As is the case with allied forms, 

 this species appears to require the previous presence of 

 aphides or scale insects to furnish ' honey-dew ' for its 

 nourishment; consequently the mode of treatment already 

 given would be found effective. 



M'Alpine, Proc. Linn. Soc., N.S. Wales, 1896, p. 469, 

 12 pi. 



MANGO BLACK-BLIGHT 

 (Dimerosporium mangiferum, Sacc. 

 = Capnodium mangiferum, Cke. and Broome.) 



This fungus forms intensely black, velvety patches on 

 both sides of the mango leaves (Mangifera indicd], some- 

 times entirely covering the leaf; and as the fungus spreads 

 quickly, owing to its varied modes of reproduction, much 

 injury is done to the trees. It is certain that this species, 

 like many other black, incrusting, non- parasitic fungi, 

 follows aphides, scale, or other * honey-dew '-producing 

 insects ; hence the preventive means necessary are those 

 calculated to destroy the insects ; resin-wash being a 

 proved remedy. 



SPHAERIACEAE 



SUGAR-CANE DISEASE 

 (Trichosphaeria sacchari, Massee.) 



This is a wound fungus, gaining access to the interior 

 of the sugar-cane through the broken ends of lateral 



