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The Efficiency of Noni (Morinda citrifolia L.) Essential Oil on the Control of Leaf Spot Caused by Exserohilum turcicum in Maize Culture
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Medicines 2017, 4(3), 62; doi:10.3390/medicines4030062

Essential Oil of Cymbopogon citratus on the Control of the Curvularia Leaf Spot Disease on Maize

Federal University of Tocantins, Gurupi Campus, 77402-970 Gurupi, Brazil
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Academic Editor: Eleni Skaltsa
Received: 13 July 2017 / Revised: 9 August 2017 / Accepted: 18 August 2017 / Published: 20 August 2017
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Abstract

The Curvularia Leaf Spot is becoming more common due to the culture expansion and the low resistance of the cultivated genotypes in tropical regions. Thus, the objective was to evaluate the fungitoxicity of the essential oil of Cymbopogon citratus upon the phytopathogen Curvularia lunata, causative agent of the Curvularia Leaf Spot. There was realized pathogenicity tests of C. lunata in maize plants, phytotoxicity of the essential oil of C. citratus and gas chromatography attached, germination tests of the conidia, and of in vitro inhibition of C. lunata. Also, there were realized tests aiming at verifying the phytopathogen control in vivo. In the pathogenicity tests, there were verified symptoms of the disease in all of the suspensions tested on plants. It was observed that the essential oil concentrations of 7.5 µL mL−1 to 50 µL mL−1 were phytotoxic. The majoritarian chemical components of the essential oil of C. citratus were Geranial (41.46%) and Neral (32.43%). The concentrations of 5 and 7.5 µL mL−1 inhibited 100% of conidia germination. None of the concentrations evaluated effectively inhibited C. lunata mycelial growth in in vitro tests. In the preventive control, the concentration of 7.5 µL mL−1 was sufficient for the reduction of the progress of the disease, however the curative control was not efficient on the tested dosages. View Full-Text
Keywords: botanical fungicide; lemongrass; Zea mays; preventive control; curative control botanical fungicide; lemongrass; Zea mays; preventive control; curative control
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MDPI and ACS Style

Mourão, D.S.C.; Ferreira de Souza Pereira, T.; Souza, D.J.; Chagas Júnior, A.F.; Dalcin, M.S.; Veloso, R.A.; Leão, E.U.; Santos, G.R. Essential Oil of Cymbopogon citratus on the Control of the Curvularia Leaf Spot Disease on Maize. Medicines 2017, 4, 62.

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