Role of hydrogen peroxide in management of root rot and wilt disease of thyme plant
Thyme (Thymus vulgaris) is an aromatic medicinal plant cultivated in many countries, including Egypt. The plant has many medicinal benefits that make it an important medical crop. In 2017, root rot and wilt symptoms were detected on thyme plants at different locations of Giza governorate and samples were collected from the infected plants. Seven fungi were isolated from the infected plants (Pythium sp., Fusarium solani, Rhizoctonia solani, Macrophomina phaseolina, F. oxysporum, Botryodiplodia sp., Alternaria tennis). Pathogenicity tests of the isolated fungi proved that all of them were pathogenic to thyme. The effect of hydrogen peroxide at different concentrations (0.25%, 0.50%, 1 % and 2%) on linear growth of Botryodiplodia sp., F. oxysporum, F. solani, M. phaseolina, Pythium sp. and R. solani was evaluated in vitro. All concentrations significantly reduced the fungal linear growth of all the tested fungi. However, the concentration of 2% was completely inhibited the fungal growth of R. solani, Pythium sp. and F. solani. Evaluation of hydrogen peroxide application as seed treatment and soil drenching for controlling root rot and wilt disease of thyme was also performed under greenhouse conditions. A remarkable reduction in pre- and post- emergence damping off as a response to hydrogen peroxide was detected with all the tested fungi. Furthermore, the treatment of hydrogen peroxide yielded serious increasing in plant survival with all tested fungi compared with untreated plants.
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