Soil fumigation with mustard essential oil to control bacterial wilt in tomato
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In vitro experiments showed that six isolates, belonging to different biovars, were equally susceptible to mustard essential oil (MEO) vapor. The proportion of cell mortality and colony growth inhibition were directly related to the dose of MEO. A 24 h exposure to 1 or 2 μL of AITC per liter of box volume resulted in mortality of 89% and 92% of cells, respectively, and exposure to 10 μL L−1 resulted in 100% cell mortality. The growth of developing colonies was reduced by 89% at 2 or 4 μL L−1 and by 96% at 6 or 10 μL L−1. The leakage of intracellular materials increased with increasing doses of MEO vapor. The decline in soil inoculum density by fumigation was directly related to the MEO dose. The initial inoculum density of approximately 3 × 105 colony-forming units per gram of soil declined by 67, 91 and 96% at fumigation doses of 25, 50 and 75 μL of allyl isothiocyanate (AITC) per liter of soil, respectively. The pathogen was not detected at a fumigation dose of 100 μL L−1. Disease control was also related to the fumigation dose. After 48 days, the bacterial wilt symptoms did not develop on the tomatoes when the soil was fumigated at 100 μL L−1 or higher.
KeywordsMustard essential oil Control of bacterial wilt Plant essential oil Ralstonia solanacearum
The first author would like to express their gratitude to Fundação de Amparo à Pesquisa do Estado de Minas Gerais - FAPEMIG for their M.Sc. fellowship. O. D. Dhingra would like to thank CNPq for his research fellowship.
This study was funded by Fundação de Amparo à Pesquisa do Estado de Minas Gerais - FAPEMIG
Compliance with ethical standards
Conflict of Interest
The authors declare that they have no conflict of interest.
Research involving human participants and or animals
This article does not contain any studies with human participants or animals performed by any of the authors.
Additional informed consent was obtained from all individual participants for whom identifying information is included in this article.
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