ðɪ ɪnfˈɛkʃən ʌvðə hˈoʊst plˈænt bɪɡˈɪnz wɪððə sˈɛkʃuːəl ɐskˈɑːspoːɹz, ɔːɹ ðɪ eɪsˈɛkʃuːəl kənˈɪdiə dʒˈɜːmᵻnˌeɪɾɪŋ ɔnðə sˈɜːfɪs ʌvðə plˈænts lˈiːf ɔːɹ stˈɛm, ɹɪzˈʌltɪŋ ɪn sˈɛpteɪt maɪsˈiːliəm ʌv ˌʌnɪnˈʌkliːˌeɪt sˈɛlz.
The infection of the host plant begins with the sexual ascospores, or the asexual conidia germinating on the surface of the plants leaf or stem, resulting in septate mycelium of uninucleate cells.