<b>Essential oils from <i>Hyptis marrubioides</i>, <i>Aloysia gratissima</i> and <i>Cordia verbenacea</i> reduce the progress of Asian soybean rust

• DOI: 10.4025/actasciagron.v36i2.17441
• Publication Date: 2014-05-20T07:55:07Z
• Authors: André Costa da Silva; Paulo Estevão de ...; Douglas Carvalho ...; Walmes Marques Ze...; José Eduardo Bras...
• Keywords: Urediniospore; Phakopsora pachyrhizi; Soybean rust; Spore germination

The aim of this study was to evaluate the potential essential oils derived from Hyptis marrubioides, Aloysia gratissima and Cordia verbenacea for controlling Asian soybean rust. inhibitory activities (applied in a concentration range 0.05 - 2%) on germination Phakopsora pachyrhizi urediniospores were investigated using vitro assays. curative eradicating properties 0.5%) studied under greenhouse conditions P. pachyrhizi-susceptible cultivar MG/BR 46 (Conquista). Scanning electron microscopy employed investigate effects morphology urediniospores. treatment with at all concentrations tested led total inhibition spore vitro. application reduced disease severity, expressed as area disease-progress curves, by 33 41%, whereas commercial fungicide (pyraclostrobin + epoxyconazole) positive control severity 61%. infected plants resulted morphological alterations fungal structures that similar those produced fungicide, namely, shrivelling urediniospores, appressoria, germ tubes paraphyses.