Evaluation of the curative effect of Cymbopogen nordus (L.) Rendle essential oil on Fusarium wilt of abaca (Musa textilis Nee)
2017
Gaña, R.R.B. | Ata, J.P. | Manalo, M.Ma.Q.
Abaca (Musa textilis), a native species in the Philippines, is a reforestation crop integrated in different agroforestry farming systems in the country. In this study, the effect of citronella (Cymbopogon nardus) essential oil was observed to inhibit mycelial growth of Fusarium oxysporum f.sp. cubense (E. F. Smith) W.C. Snyder and H.N. Hansen causing Fusarium wilt disease in abaca in vitro and its disease symptoms in vivo. Four different concentrations (0.001%, 0.025%, 0.05% and 0.1% v/v) were used for the in vitro assay within 21 days of observation. Mycelial growth was significantly inhibited in the 0.05% and 0.1% concentrations. For the in vivo assay, the 0.1% v/v concentration was used to test the efficacy of citronella essential oil in suppressing leaf symptoms of Fusarium wilt disease on Abaca seedlings using the Disease Severity Index (DSI). The Fusarium-inoculated seedlings with citronella essential oil had the highest DSI (2.8), followed by seedlings with inoculation but without essential oil (2.7), seedlings both without inoculation and essential oil (control) (1.6), and seedling without inoculation but with essential oil (1.13). Findings showed that citronella essential oil can lessen the occurrence of morphological symptoms such as leaf spots and anthracnose that are not visible symptoms of the Fusarium wilt disease.
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