MELIOLA 163 



aphides should be kept in check. Resin wash is the best- 

 known remedy for the sooty moulds. 



Often covering the entire surface of the leaf with a black, 

 velvety felt ; perithecia narrowly ovate, elongated, asci pear- 

 shaped, 48-50 x 30 /a, 8-spored ; spores hyaline, i-septate, 

 elliptical, slightly constricted at the septum, 12-15x5-6 /*. 



MELIOLA (FRIES.) 



Perithecia seated on black, radiating mycelium, globose, 

 often furnished with specialised appendages ; asci subglobose, 



FlG. 42. Meliola Penzigii. Sooty mould of 

 orange and citron, on orange leaves. Nat. size. 



2-8-spored ; spores 2-5-septate, sometimes muriform, hyaline 

 or coloured. 



Sooty mould of orange. ---This disease is more or less 

 prevalent wherever the orange is cultivated. In Europe and 

 the United States the injury is usually attributed to Meliola 



