Effect of selected essential oil plants on bacterial wilt disease development in potatoes

Abstract

Objective: Bacterial wilt disease caused by Ralstonia solanacearum is a major constrain to production of potatoes (Solanum tuberosum). Control of bacterial wilt is very difficult as there are no effective curative chemicals. This study was aimed at investigating the potential roles of essential oil plants in control of the disease. Methodology and Result: The plants used included: Lippie javanica (Sage brush), Ocimum suave (Cambodia) and Tarchonanthus camphorates (Camphor brush).Experiments were conducted with potatoes grown in greenhouse condition. Freshly harvested leaves, stems and flowers from L. javanica, O. suave and T. camphorates were chopped into small portions that were soaked in water for one hour then applied in the inoculated experimental plots. Each plot was planted with disease-free potato tubers and disease development observed and recorded for a period of two months. Plots treated with T. camphorates had significantly low bacterial wilt incidence (P< 0.05) having been reduced by more than 90%.Treatment with the other two plants, O. suave and L. javanica reduced the disease by 38% and 21% respectively and were not significantly different from untreated plots. Conclusion and Application of Results:This finding shows that use of essential oils isa potential approach to bacterial wilt disease management. It can be concluded that essential oils plants possess antibacterial activity that is effective in control of R. solanacearum. Application of these essential oils can volatilize with increase of temperature. The application can be done by burying chopped essential oil plant parts in the soil during the time of land preparation just before planting. Further studies on the mode of action of these essential oils particularly those of T. comphrates in the control of R. solanacearum are suggested.

Antibacterial activity of guava, moringa, camphor bush and pelargonium extracts against bacterial wilt (Ralstonia pseudosolanacearum sp. nov.) of potato

“…The varied antibacterial activity between the plant extracts can be attributed to diversity and or difference in concentrations of secondary metabolites in each plat extract ( Yihune and Yemata 2019 ). These in-vitro results were in accordance with those of Oboo et al, 2014 , Biswal, 2015 who reported antibacterial activity of these plant extracts against R. pseudosolanacearum sp. nov. in-vitro.…”

“…The phytobiocidal effect of various plant extracts against R. pseudosolanacearum sp. nov. has been demonstrated by several researchers both in-vitro and in-vivo ( Hassan et al, 2009 , Oboo et al, 2014 , Din et al, 2016 , Mutimawurugo et al, 2020 , Wamani, 2020 ). However, the phytochemical composition of these bioactive compounds varies from one plant to another and their effectiveness is also affected by variation in agro-climatic conditions coupled with varied abiotic factors during plant growth ( Liu et al, 2016a , Liu et al, 2016b , Kumar et al, 2017 , Gololo, 2018 ).…”

“…Due to these limitations especially high phytosanitary standards and negative environmental effects associated with few commercialized chemical bactericides as well as inadequate number of commercialized botanicals (plant extracts) for management of bacterial wilt of potatoes, efforts have been focused on development of botanicals as eco-friendly management options against bacterial wilt pathogen ( Oboo et al, 2014 , Karim and Hossain, 2018 ). The phytobiocidal effect of various plant extracts against R. pseudosolanacearum sp.…”

Using of Tamarind and Vanilla Essential Oils for the Management of Brown Rot Disease of Potato

“…The disease rating decreased from 4.2 in the control to 1.6 and 2.2 in plants treated with TEO and VEO, respectively. These results had the confirmation of Oboo et al, (2014) who indicated that EOs decreased the disease incidence of bacterial wilt of potato. The decrease of disease rating may due to the inhibitory effect of the two EOs against the test bacterial pathogen and the increase of systemic induced resistance of potato plant.…”

“…Moreover, the EOs are considered a new horizon to fight the bacterial antibiotic resistance (Yap et al, 2014). Oboo et al (2014) revealed that the EOs of Tarchonanthus camphorates (Camphor brush), Ocimum suave (Cambodia) and Lippie javanica (Sage brush) significantly reduced the bacterial wilt disease of potato. Li and Yu (2015) reported that the EO obtained from the leaves of Macleaya cordata R. Br.…”