Penyakit moler pada tanaman bawang merah yang disebabkan oleh Fusarium oxysporum f.sp cepae termasuk penyakit yang sangat berbahaya karena serangannya yang cepat, menyebabkan tanaman mati dan berakibat gagal panen. Pengendalian penyakit sendiri memiliki berbagai macam cara yaitu menggunakan pestisida nabati, agen hayati, maupun kimia. Cara alternatif dalam pengendalian penyakit moler yaitu menggunakan agen hayati Trichoderma sp agar mengurangi resiko dari penggunaan bahan kimia. Tujuan dilakukannya penelitian ini adalah untuk mengetahui kemampuan tiga isolat Trichoderma sp. asal lahan rawa pasang surut dalam mengendalikan penyakit moler pada bawang merah. Penelitian menggunakan Rancangan Acak Lengkap yang terdiri dari 6 perlakuan dan 4 ulangan, sehingga terbentuk 24 satuan percobaan. Perlakuan terdiri dari T0 Tanpa pemberian Trichoderma dan tanpa inokulasi Fusarium, T1 Tanpa pemberian Trichoderma dan inokulasi Fusarium, T2a Kontrol dengan menggunakan fungisida Benlate dan Fusarium, T3 Trichoderma asal isolat Kaladan, Kab. Tapin dan Fusarium, T4 Trichoderma asal isolat Landasan Ulin dan Fusarium, T5 Trichoderma asal isolat Barambai Kab. Barito Kuala dan Fusarium. Hasil penelitian menunjukkan bahwa Trichoderma sp. mampu menekan serangan penyakit layu Fusarium pada tanaman bawang merah Intensitas serangan tertinggi ditemukan pada perlakuan kontrol yaitu tanaman yang diinokulasi Fusarium oxysporum dengan nilai sebesar 100%, sedangkan tanaman bawang merah yang diberi perlakuan Trichoderma sp. mampu menahan serangan F. oxysporum dengan intensitas serangan sebesar 0. Tiga isolat Trichoderma sp. yakni asal Kaladan, Landasan Ulin dan Barambai, efektif mengendalikan penyakit moler bawang merah yang disebabkan oleh Fusarium oxysporum f.sp
Moler disease in red onion caused by Fusarium oxysporum f.sp cepae is a very dangerous disease because of its fast attack, causing plant death and resulting in crop failure. Disease control itself has various ways, namely using plant-based pesticides, biological agents, and chemicals. An alternative way of controlling moler disease is using the biological agent Trichoderma sp to reduce the risk of using chemicals. The purpose of this study was to determine the ability of three Trichoderma sp. isolates. origin of tidal swamp land in controlling moler disease in red onion. The study used a completely randomized design consisting of 6 treatments and 4 replications, resulting in 24 experimental units. The treatment consisted of T0 without Trichoderma and without Fusarium inoculation, T1 without Trichoderma and Fusarium inoculation, T2a Control using Benlate and Fusarium fungicide, T3 Trichoderma from Kaladan isolate, Kab. Tapin and Fusarium, T4 Trichoderma from runway Ulin and Fusarium isolates, T5 Trichoderma from Barambai isolate, Kab. Barito Kuala and Fusarium. The results showed that Trichoderma sp. able to suppress Fusarium wilt attack on red onion plants The highest attack intensity was found in the control treatment, namely plants inoculated with Fusarium oxysporum with a value of 100%, while onion red plants treated with Trichoderma sp. able to withstand F. oxysporum attack with an attack intensity of 0. Three isolates of Trichoderma sp. namely from Kaladan, Anvil Ulin and Barambai, effectively controlling onion red moler disease caused by Fusarium oxysporum f.sp.
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