Effectiveness of some resistance inducers for controlling carnation vascular wilting caused by<i>Fusarium oxysporum</i>f. sp.<i>dianthi</i>
Walter Hernando Pérez Mora, Luz Marina Melgarejo, Harold Dubán Ardila
Abstract
The effect of different resistance inducers against carnation vascular wilting caused by Fusarium oxysporum f. sp. dianthi (Fod) was evaluated, as well as its relation with the content of phenols and flavonoids in roots of the carnation plants. Indexed cuttings of carnation (Dianthus caryophyllus L.) were used with three-weeks of rooting (variety Solex susceptible to the disease). The resistance inducers: Ascorbic Acid, Salicylic Acid, Thiamine and Potassium Phosphite, were applied by spray or drench before Fod inoculation. Compared to controls, it was found that disease incidence and severity measured as the area under the disease progress curve, decreased with the application of all inductors except for K3PO3 spray-applied treatment. Plants treated with thiamine showed, in addition, an increase in the content of phenols and flavonoids. These results suggested the potential of thiamine as a resistance inducer in the management of carnation vascular wilting caused by Fusarium oxysporum f. sp. dianthi.