This study investigated the efficacy of Glomus mosseae and thyme and peppermint oils in controlling
bacterial wilt disease (BW) of tomato caused by Ralstonia solanacearum under in vitro conditions and
under greenhouse and field conditions. In an in vitro study, we tested nine plant oils against
R. solanacearum, and the results demonstrate that only caraway, thyme, peppermint and marjoram oils
inhibited the growth of the BW pathogen with differing degrees, thyme oil caused the highest reduction
of the growth of the pathogen followed by peppermint and the lowest was caraway and marjoram. We
evaluated the effect of thyme and peppermint under greenhouse and field conditions. Under greenhouse
conditions, the thyme treatment exhibited the highest disease reduction percentage followed by the
thyme þ peppermint treatment, while G. mosseae caused the least disease reduction percentage. Under
field experiments, thyme oil treatment exhibited the highest ability to reduce the disease by 94.8 and
97.1% in the 2011 and 2012 growing seasons, respectively, followed by the treatment of thyme
oil þ peppermint oil with the reduction of 89.5 and 82.4%, respectively. G. mosseae exhibited the lowest
percentage of disease reduction; however, it caused a greater yield increase percentage during both of
the tested seasons.
This study investigated the efficacy of Glomus mosseae and thyme and peppermint oils in controllingbacterial wilt disease (BW) of tomato caused by Ralstonia solanacearum under in vitro conditions andunder greenhouse and field conditions. In an in vitro study, we tested nine plant oils againstR. solanacearum, and the results demonstrate that only caraway, thyme, peppermint and marjoram oilsinhibited the growth of the BW pathogen with differing degrees, thyme oil caused the highest reductionof the growth of the pathogen followed by peppermint and the lowest was caraway and marjoram. Weevaluated the effect of thyme and peppermint under greenhouse and field conditions. Under greenhouseconditions, the thyme treatment exhibited the highest disease reduction percentage followed by thethyme þ peppermint treatment, while G. mosseae caused the least disease reduction percentage. Underfield experiments, thyme oil treatment exhibited the highest ability to reduce the disease by 94.8 and97.1% in the 2011 and 2012 growing seasons, respectively, followed by the treatment of thymeoil þ peppermint oil with the reduction of 89.5 and 82.4%, respectively. G. mosseae exhibited the lowestpercentage of disease reduction; however, it caused a greater yield increase percentage during both ofthe tested seasons.
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