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KMID : 1160220140420040376
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Mycobiology
2014 Volume.42 No. 4 p.376 ~ p.384
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Control of Root Rot and Wilt Diseases of Roselle under Field Conditions
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Hassan Naglaa
Elsharkawy Mohsen Mohamed
Shimizu Masafumi
Hyakumachi Mitsuro
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Abstract
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Roselle (Hibiscus sabdariffa L.) is one of the most important medicinal crops in many parts of the world. In this study,the effects of microelements, antioxidants, and bioagents on Fusarium oxysporum, F. solani, and Macrophomina phaseolina, thecausal pathogens of root rot and wilt diseases in roselle, were examined under field conditions. Preliminary studies were carriedout in vitro in order to select the most effective members to be used in field control trials. Our results showed that microelements(copper and manganese), antioxidants (salicylic acid, ascorbic acid, and EDTA), a fungicide (Dithane M45) and biological controlagents (Trichoderma harzianum and Bacillus subtilis) were significantly reduced the linear growth of the causal pathogens. Additionally, application of the previous microelements, antioxidants, a fungicide and biological control agents significantlyreduced disease incidence of root rot and wilt diseases under field conditions. Copper, salicylic acid, and T. harzianum showedthe best results in this respect. In conclusion, microelements, antioxidants, and biocontrol agents could be used as alternativestrategies to fungicides for controlling root rot and wilt diseases in roselle.
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KEYWORD
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Biological control, Hibiscus, Root rot disease, Wilt disease
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