A commercial iron fertilizer increases the survival of Fusarium oxysporum f. sp. orthoceras propagules in a wheat flour-kaolin formulation |
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Authors: | Dorette Müller-Stöver Joachim Sauerborn |
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Institution: |
a Institute of Plant Production and Agroecology in the Tropics and Subtropics (380), University of Hohenheim, Stuttgart, Germany |
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Abstract: | Fusarium oxysporum f.sp. orthoceras, a potential biocontrol agent against the parasitic weed Orobanche cumana Wallr., has proven to be efficacous under greenhouse conditions when formulated as wheat-kaolin granules. To help minimize the loss of viable fungal propagules during the formulation process, the addition of a commercial fertilizer containing the iron chelate of EDDHA to the formulation was investigated. The proportion of surviving propagules was significantly increased after adding the fertilizer. However, growing conidia in fertilizer-amended liquid medium did not reduce losses in viability during formulation. The efficacy of the formulated fungus and the storability at room temperature for the first 3 months was not affected by the iron fertilizer. The protective effect could neither be obtained with the chelator EDDHA alone nor with FeEDTA or FeSO4. |
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Keywords: | Fusarium oxysporum Orobanche spp FeEDDHA iron chelate formulation mycoherbicide |
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