CYCLOCONIUM 46 



on the stem, leaves, and young fruit, which gradually increase 

 in size, cause depressions, and corrode and destroy the 

 tissues. On the fruit these blackish blotches resemble a 

 kind of canker which causes the fruit to rot and decay 

 quickly. Young plants are also often killed. Scolecotrichum 

 melophthorum (Prill, and Del.) is the cause of this disease. 



Conidiophores straight, erect, bearing at the apex 2-4 short 

 chains of 2-3 olive brown conidia, elliptic-oblong, continuous 

 or septate, measuring 10X3-4 /*, up to 20-25x5-6 ft, and 

 then septate. 



Prillieux and Delacroix, Bull. Soc. Mycol.^ 7, p. 218. 



Scolecotrichum clavariarum (Sacc.), forming blackish stains 

 on the lower portions of various species of Clavaria^ as C. 

 rugosa, C.fuliginea, etc. 



Hyphae densely aggregated, simple, short, straight, obtuse, 

 septate, dark coloured ; conidia oblong, i -septate, constricted, 

 pellucid or opaque, cells often unequal, 15-20X8 /z. 



FUSIOLADIUM (BON.) 



Hyphae short, straight, sparingly septate, somewhat 

 fasciculate, coloured ; conidia ovoid or subclavate, for a 

 long time continuous, then i -septate, coloured. 



Cherry scab. Ripe cherries are often disfigured by the 

 presence of one or more blackish-olive, minutely velvety 

 blotches caused by Fusicladium cerasi, Sacc. ( = Acrosporium 

 cerasi, Rabenh.). When the fruit is attacked at an early 

 stage its growth is arrested, and it often remains attached to 

 the tree for a long time in a mummified condition. Pre- 

 sumably the fungus also attacks the young shoots and the 

 leaves, but this is not definitely known. From analogy this 

 fungus is the conidial form of a Venturia. 



Conidia oblong, ends narrowed, tinged olive, i-septate 

 when quite mature, 20-25 X4~5 p. 



Treatment same as for apple and pear scab. 



CYCLOCONIUM (CAST.) 



Mycelium growing in a circinate manner on leaves, 

 fugacious, black ; conidia ovate, i-septate, springing at once 

 from the mycelium, coloured, solitary. 



