Efficacy of Leaf Oil from Pimenta racemosa var. racemosa in Controlling Bacterial Wilt of Tomato

Abstract

Bacterial wilt, caused by Ralstonia solanacearum, is a major plant disease throughout the Caribbean. The ability of the essential oil from Pimenta racemosa var. racemosa to control bacterial wilt of tomato (R. solanacearum, phylotype IIB/4NPB) was investigated. Lemongrass (chemotype 1)-, aniseed (chemotype 2)-, and clove (chemotype 3)-scented chemotypes of P. racemosa var. racemosa essential oil were tested. Six concentrations of emulsified essential oil (from 0.01 to 0.14% [v/v]) were evaluated by in vitro culture amendment assays and by in vivo experiments in greenhouse. Chemotype 3 displayed remarkable in vitro antibacterial activity against R. solanacearum, because the minimum inhibitory concentration was only 0.03%, compared with 0.14% for chemotypes 1 and 2. In greenhouse experiments, no incidence of bacterial wilt was observed in tomato plants grown in soil treated with chemotype 3 of P. racemosa var. racemosa at a concentration of 0.14%. In the untreated control soil, 62% of plants displayed symptoms of bacterial wilt. Treatment with chemotype 3 significantly increased the growth of tomato plants compared with untreated controls. These results suggest that chemotype 3 of P. racemosa var. racemosa essential oil is a good candidate for further development as a soil biofumigant for the control of tomato bacterial wilt.

Biological Activity of <i>Syzygium aromaticum</i> and <i>Ravensara aromatica</i> Essential Oils from Madagascar and Their Possible Use against Postharvest Mango Anthracnose

“…The Similar to its phytotoxic effects [25] and to the antibacterial effect of Pimenta racemosa var. racemosa leaf Eo against tomato wilt [34], the antifungal properties of Ravensara aromatica Eo also vary with the Eo chemotypes. Therefore, the antifungal activity of different doses of major components should be compared in order to confirm such a hypothesis.…”

Essential oils control anthracnose in pepper seeds

“…We propose that the antimicrobial mode of action of clove essential oil could be linked to eugenol, which is reported in the literature to be the major component of this essential oil. A recent study by Deberdt et al (2018) demonstrated that Pimenta racemosa var. racemosa essential oil, in which eugenol is the major component, influenced tomato resistance to bacterial wilt.…”

Essential oils in the management of soft rot of kale in the brazilian semiarid region

“…In the last years plant essential oils have been extensively studied and are a promising alternative for plant disease management due to their antimicrobial properties (DEBERDT et al, 2018;SILVA et al, 2017). Several previous studies have shown that essential oils can be used in the management of soft rot caused by Pectobacterium species, such as P. carotovorum subsp.…”