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Investigations for development of a combined biological-physical method to control soil-borne and seed-borne pathogens in carrot seed



Investigations for development of a combined biological-physical method to control soil-borne and seed-borne pathogens in carrot seed



Zeitschrift fuer Pflanzenkrankheiten und Pflanzenschutz 105(4): 359-375



More than 20 bacterial strains, preselected in a joint project, were tested against the soil-borne pathogens Pythium ultimum and Rhizoctonia solani. Four Pseudomonas and five Bacillus strains turned out to be effective against both pathogens in vitro. In infested soil, two Pseudomonas strains were effective against both pathogens, roughly co the same degree. Besides the emergence, plant growth was improved. The studies also showed applicability of electron treatment to carrot seed. Well tolerated electron treatment reduced seed infestation with Alternaria spp. by an average of 50%. Infestation with Alternaria radicina was reduced by about 80%. It definitely improved the sanitary state of seedlings, as well as emergence and yield in non-infested soil. A good effect was also achieved against Xanthomonas campestris. Combined treatment with electrons and antagonistic bacterial strains was tested in artificially infested soil and in the field, using one of the Pseudomonas strains selected as being efficient. Drenching with the antagonistic strain notably improved emergence and yield. When the soil was strongly infested with Rhizoctonia solani, however, the combined treatment tended to reduce the yield. Seed treatments together with other influences at early stages of plant development obviously amount to a stress situation which the plant can no longer compensate.

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Accession: 003183231

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