Etiologi Penyakit Antraknosa pada Bawang Merah yang Disebabkan oleh Colletotrichum gloeosporioides

Penyakit antraknosa dapat terjadi pada seluruh fase pertumbuhan tanaman bawang merah (Allium cepa var. aggregatum) dan belum diketahui proses perkembangannya serta karakteristik penyebabnya. Penelitian dilakukan untuk mempelajari etiologi penyakit antraknosa yang meliputi perkembangan gejala, periode inkubasi dan karakteristik patogen melalui pengujian secara in vivo dan in planta. Awal gejala ialah munculnya bercak putih yang kemudian membesar hingga menyebabkan jaringan mati. Gejala khas yang ditimbulkan ialah adanya pola konsentris berwarna jingga kecokelatan pada bercak dan memiliki periode inkubasi 2-4 hari. Karakteristik morfologi koloni patogen berwarna putih, konidium berbentuk silindris, hifa bersekat. Karakter lain ditandai dengan keberadaan aservulus dan setae. Patogen yang diidentifikasi secara molekuler menunjukkan 99.51% homologi dengan Colletotrichum gloeosporioides aksesi KT390192.1 dari China yang berasal dari tanaman tembakau.Etiology of Anthracnose Disease on Shallots Caused by Colletotrichum gloeosporioides  Anthracnose disease can occur in all growth phases of shallot plants (Allium cepa var. aggregatum); however, disease development and characteristics of the causal agent are not yet known. This research was conducted to study the etiology of anthracnose disease through in vivo and in vitro approach, which includes symptom development, incubation period, and pathogen characteristics. Early symptom of the disease is indicated by the appearance of white spots which then enlarge and finally caused the tissue dies. The typical symptom involves the presence of a concentric orange-brown pattern on the spots with incubation period of 2-4 days. The morphological characteristics of the pathogen colony are white, the conidium is cylindrical, the hyphae are septate. Other character includes the presence of acervulus and setae. Molecular identification of the pathogen showed 99.51% homology with Colletotrichum gloeosporioides accession KT390192.1 from China which originates from tobacco plants