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Medicines 2017, 4(3), 60; doi:10.3390/medicines4030060

The Efficiency of Noni (Morinda citrifolia L.) Essential Oil on the Control of Leaf Spot Caused by Exserohilum turcicum in Maize Culture

1
Federal Institute of Tocantins, Araguatins Campus, 77950-000 Araguatins, TO, Brazil
2
Federal University of Tocantins, Gurupi Campus, 77402-970 Gurupi, TO, Brazil
3
Federal Institute of Tocantins, Dianópolis Campus, 77300-000 Dianópolis, TO, Brazil
*
Author to whom correspondence should be addressed.
Academic Editor: Eleni Skaltsa
Received: 13 July 2017 / Revised: 9 August 2017 / Accepted: 10 August 2017 / Published: 14 August 2017
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Abstract

The objective of this work was to evaluate the efficiency of noni essential oil on the control of Exserohilum turcicum, a causative agent of Exserohilum spot in maize culture. In the sanitary test 400 seeds were incubated using the blotter test method. For the transmissibility test, the fragments of damaged leaves of seedlings were removed and put into a potato, dextrose and agar (PDA) culture environment. To verify the pathogenicity, Koch´s postulates were performed. In the phytotoxicity test different concentrations of noni oil were applied in maize seedlings. E. turcicum conidia were submitted to different concentrations of noni oil. In the preventive and curative tests noni essential oils were applied before and after the conidia inoculation, respectively. The results revealed the presence of fungi of the genres Aspergillus, Penicillium, Rhizopus, Fusarium, and Exserohilum in the maize seeds. The pathogenicity of E. turcicum and also the transmission of this fungus from the seeds to the maize seedlings was confirmed. The inhibition of conidia germination was proportional to the concentration increase. The preventive application of noni essential oil was the most efficient on the control of Exserohilum spot. View Full-Text
Keywords: alternative control; medicinal plants; Zea mays; Exserohilum spot alternative control; medicinal plants; Zea mays; Exserohilum spot
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MDPI and ACS Style

Silva, J.C.E.; Mourão, D.S.C.; Lima, F.S.O.; Sarmento, R.A.; Dalcin, M.S.; Aguiar, R.W.S.; Santos, G.R. The Efficiency of Noni (Morinda citrifolia L.) Essential Oil on the Control of Leaf Spot Caused by Exserohilum turcicum in Maize Culture. Medicines 2017, 4, 60.

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