Article CC BY-NC-ND 4.0
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Characterisation of Trichoderma sp. BI 7376 and Pseudomonas chlororaphis subsp. aurantiaca BI 7439 as maize seed treatment for commercial traits

GND
1059093731
Affiliation
Julius Kühn-Institute (JKI), Institute for Biological Control, Germany
Koch, Eckhard;
GND
1210966239
Affiliation
Julius Kühn-Institute (JKI), Institute for Biological Control, Germany
Pfeiffer, Tobias;
Affiliation
Julius Kühn-Institute (JKI), Institute for Biological Control, Germany
von Galen, Astrid;
Affiliation
Christian-Albrechts-University of Kiel, Department of Plant Diseases and Crop Protection, Institute of Phytopathology, Faculty of Agricultural and Nutritional Science, Germany
Birr, Tim;
Affiliation
Christian-Albrechts-University of Kiel, Variationsstatistik, Faculty of Agricultural and Nutritional Sciences, Germany
Hasler, Mario;
Affiliation
dEVONTA-Service GmbH, Lohmen, Germany
Kotte, Mathias;
Affiliation
DSV Deutsche Saatveredelung GmbH, Asendorf, Germany
Feuerstein, Ulf;
GND
1123666768
Affiliation
Julius Kühn Institute (JKI), Institute of Plant Protection in Field Crops and Grassland, Germany
Meyer-Wohlfarth, Friederike;
GND
117333632X
Affiliation
Julius Kühn-Institute (JKI), Institute for Biological Control, Germany
Zink, Petra;
GND
141068868
Affiliation
Julius Kühn-Institute (JKI), Institute for Biological Control, Germany
Linkies, Ada

In previous experiments, Trichoderma sp. BI 7376 and Pseudomonas chlororaphis subsp. aurantiaca BI 7439, applied as seed treatments, controlled soilborne Fusarium culmorum on maize. The current paper is focused on a deeper characterization of the effects of both strains. The experiments were conducted as pot tests with artificial inoculation of the substrate with F. culmorum, or with maize seed lots infected with Fusarium spp. When seeds were treated with Trichoderma strain BI 7376, Pseudomonas strain BI 7439 or with the chemical active ingredient thiram and stored before they were sown in substrate inoculated with F. culmorum, the protection by all agents declined. During the storage period of 211 days, the activity of thiram and Trichoderma strain BI 7376 dropped by about 38% and 57%, respectively. After 36 days of storage, Pseudomonas strain BI 7439 failed to provide any protection, which was obviously related to the observed total loss of viable cells of this agent. Moreover, we observed that both strains protected against soilborne F. subglutinans and F. verticillioides, showing that their activity was not limited to F. culmorum which was used in the previous experiments. Further, experiments with seed lots suspected or known to be infected with Fusarium species indicated that Trichoderma strain BI 7376 also controlled seedborne inoculum. When electron seed treatment was followed by application of Trichoderma strain BI 7376, both seed- and soilborne infections were controlled, showing that the concept of using a combination of a physical seed treatment and microbial antagonists appears feasible.

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License Holder: 2023 The Author(s).

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