The aim of this study was to evaluate the potential of the essential oil of lemon grass (Cymbopogon
citratus) for the control of isariopsis leaf spot (Pseudocercospora vitis) and downy mildew (Plasmopara
viticola) in grapevine cv. Isabel, the effect of the essential oil on the productivity of the grapevines and the
effect of the essential oil on the activity of the enzymes chitinase and catalase. The experiment was
conducted in a commercial vineyard over two consecutive crop cycles. Each plant in the experiment was
subjected to one of the following nine treatments: 0, 0.5, 1.0, 2.0 or 4.0 mL L1 essential oil, Tween 80%,
Bordeaux mixture, Acibenzolar-S-methyl and mancozeb. An analysis of the area under the disease
progress curve showed a quadratic response by both diseases to the doses of essential oil during the first
and second crop cycles. The essential oil treatments also increased the number and mass of the clusters
of fruit as well as the productivity and desirable chemical characteristics of the grape. The activity of
chitinase increased as a result of the essential oil treatments, whereas the activity of catalase decreased.
The essential oil at doses of 1.0 and 2.0 mL L1 can serve as an alternative means of controlling isariopsis
leaf spot and downy mildew and can also serve to improve the fruit quality of grapes cv. Isabel in tropical
regions.
The aim of this study was to evaluate the potential of the essential oil of lemon grass (Cymbopogoncitratus) for the control of isariopsis leaf spot (Pseudocercospora vitis) and downy mildew (Plasmoparaviticola) in grapevine cv. Isabel, the effect of the essential oil on the productivity of the grapevines and theeffect of the essential oil on the activity of the enzymes chitinase and catalase. The experiment wasconducted in a commercial vineyard over two consecutive crop cycles. Each plant in the experiment wassubjected to one of the following nine treatments: 0, 0.5, 1.0, 2.0 or 4.0 mL L1 essential oil, Tween 80%,Bordeaux mixture, Acibenzolar-S-methyl and mancozeb. An analysis of the area under the diseaseprogress curve showed a quadratic response by both diseases to the doses of essential oil during the firstand second crop cycles. The essential oil treatments also increased the number and mass of the clustersof fruit as well as the productivity and desirable chemical characteristics of the grape. The activity ofchitinase increased as a result of the essential oil treatments, whereas the activity of catalase decreased.The essential oil at doses of 1.0 and 2.0 mL L1 can serve as an alternative means of controlling isariopsisleaf spot and downy mildew and can also serve to improve the fruit quality of grapes cv. Isabel in tropicalregions.
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