DIAPORTHACEAE 



22S 



American chestnut. Other important pathogenic species are in- 

 ckided in Diaporthe and \^alsa. Of these species Diaporthe citri, 

 D. phaseolonmi, D. sojae, and Valsa leiicostovm are of interest. 

 The conidial stages of species of Diaporthe belong to Phomopsis; 

 of \^alsa, to Cytospora. 



Fig. 89. The svcamore-blight fungus, Gnovwnia veneta. A. Perithecium 

 in section. B. Ascus and ascospores. C. Conidial stage, commonly desig- 

 nated Gloeosporhmi nerviseqimni, on young leaves. D and E. Secondary 

 spore stages that mav prove to be spermogonia. D, on rotting leaves, re- 

 garded as Myxosporhnn valsoidewn (Discella platani) ; E, on t\vigs, desig- 

 nated Sporojievia platani. {A, C, D, and E adapted from Klebahn.) 



Diaporthe citri [Wolf (1926)] causes melanose, dieback, and 

 stem-end rot of citrus. Perithecia have been observed only on 

 twigs lying on the ground. The conidial stage of this species is 

 known as Fhoinopsis citri. 



Diaporthe phaseolonnn [Harter (1917)] attacks stems, pods, 

 and leaves of Lima bean. Perithecia mature on old pods in the 

 late summer. The conidial stage has been designated Fhoina 



