To obtain a better understanding of the onset and the progress of epidemics caused by Diaporthe adunca on Plantago lanceolata we investigated the role of the asexual phase of the fungus not only in the transmission of the disease from season to season, but also in the spread of the fungus within the same season. Splash dispersal of conidia during rain episodes proved to be an effective method for the spread of the fungus. Conidial production by pycnidia present on scapes left on the ground during winter was delayed in comparison to that of pycnidia produced on greenhouse infected scapes, indicating that the fungus overwinters with immature pycnidia. Latent infections occurred in 8.3% of the seedlings which emerged from seeds originating from infected spikes. A scenario for the transmission and spread of the fungus is proposed. [KEYWORDS: Pseudocercosporella-herpotrichoides spores; infected wheat straw; aerial dispersal; phomopsis; splash; communities; pathogens; helianthi; inoculum; nodorum]
Original languageEnglish
JournalPlant Pathology
Journal publication date1996

ID: 133550