Characterization of composted olive mill wastes to predict potential plant disease suppressiveness |
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| Authors: | Gabriele Alfano Giuseppe Lustrato Giuseppe Lima Domenico Vitullo Giancarlo Ranalli |
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| Institution: | aDepartment of Science and Technology for the Environment and Territory, University of Molise, 86090 Pesche (IS), Italy;bDepartment of Animal, Plant and Environmental Science, University of Molise, 86100 Campobasso, Italy |
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| Abstract: | Despite its proven agronomic value, the plant disease suppressive effect of composts from olive waste has not been adequately investigated. In the present study, the disease suppressive potential of two olive waste (OW) composts against soil-borne plant pathogens was investigated. Both OW composts showed sizeable, active microbial populations, which were able to grow actively on chitin and cellulose. In plate inhibition trials, OW compost water extracts (CWEs) exerted a significant inhibitory effect on the growth of the pathogens Fusarium oxysporum f.sp. lycopersici (Fol), Pythium ultimum, Phytophtora infestans, Sclerotina sclerotiorum and Verticillium dahliae; and in pot experiments, the OW composts significantly reduced P. ultimum damping-off and Fol wilt diseases on tomato seedlings. The disease suppressive effect of OW composts seems to be due to the combined effects of suppression phenomena caused by the presence of microorganisms competing for both nutrients and space as well as by the activity of specific antagonistic microorganisms. |
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| Keywords: | Olive waste compost Compost disease suppressive effect Compost water extract Microbial activity Antagonistic microorganisms |
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