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Evaluation of non-chemical seed treatment methods for control of Alternaria brassicicola on cabbage seeds

Affiliation
Department. of Cell and Molecular Biology, Göteborg, Sweden
Amein, T.;
Affiliation
Dipartimento di Scienze Animali, Vegetali e dell´Ambiente, Università degli Studi del Molise, Campobasso, Italy
Wright, S.A.;
Affiliation
Jordbruksverket, Växtskyddscentralen i Alnarp, Alnarp, Sweden
Wikström, M.;
GND
1059093731
Affiliation
Julius Kuehn-Institute (JKI), Federal Research Centre for Cultivated Plants, Institute for Biological Control, Darmstadt, Germany
Koch, Eckhard;
GND
1059101467
Affiliation
Julius Kühn-Institute (JKI), Federal Research Centre for Cultivated Plants, Institute for Biological Control, Darmstadt, Germany
Schmitt, Annegret;
GND
12081465X
Affiliation
Julius Kühn-Institute (JKI), Federal Research Centre for Cultivated Plants, Institute for Biological Control, Darmstadt, Germany
Stephan, Dietrich;
GND
1175964255
Affiliation
Julius Kühn-Institute (JKI), Federal Research Centre for Cultivated Plants, Institute for Strategies and Technology Assessment in Plant Protection, Kleinmachnow, Germany
Jahn, Marga;
Affiliation
Centre of Competence for the Innovation in the Agro-Environmental Sector (AGROINNOVA), University of Torino, Grugliasco, Italy
Tinivella, F.;
Affiliation
Centre of Competence for the Innovation in the Agro-Environmental Sector (AGROINNOVA), University of Torino, Grugliasco, Italy
Gullino, M.L.;
Affiliation
Seedgard AB, Uppsala, Sweden
Forsberg, G.;
Affiliation
Hild Samen GmbH, Marbach am Neckar, Germany
Werner, S.;
Affiliation
Plant Research International, Wageningen, Netherlands
Wolf, J. van der;
Affiliation
Plant Research International, Wageningen, Netherlands
Groot, S.P.C.

Due to the lack of foliar fungicide use, the organic production of Brassica seeds free of Alternaria spp. is difficult. Therefore, effective seed treatments certified for use in organic farming are needed to eradicate or at least effectively reduce the seed-borne inoculum. We here report results of greenhouse and field experiments in whichnon-chemical seed treatments were tested for control of A. brassicicola on cabbage seeds naturally infested with the pathogen. In greenhouse experiments, significant improvements were obtained by seed treatment with some commercialised and experimental microbial biocontrol agents, an emulsion of thyme oil in water (0.1%) and by the tested physical seed treatments methods (i.e. hot water, aerated steam and electron seed treatment). Resistance inducers tended to increase the percentage of healthy plants, but the effects were statistically not significant. Generally the combination of physical treatments with the effective agents did not result in improved performance. Positive effects on crop establishment and yield by the same treatments were also observed in field tests. Overall the results indicate that several options for non-chemical control of A. brassicicola on Brassica seeds exist that are comparable in efficacy to the chemical standard Aatiram (active ingredient thiram) used in this study.

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