Method of controlling seed disease

• US 6,823,623 B2
• Filed: 06/20/2001
• Issued: 11/30/2004
• Est. Priority Date: 06/22/2000
• Status: Active Grant

• Current Assignee: Takii & Company
• Original Assignee: Takii & Co., Ltd.
• Inventors: Shigeta, Katsumi, Minato, Kanji
• Primary Examiner(s): Poon, Peter M.
• Assistant Examiner(s): Valenti, Andrea M.
• Application Number:
  US09/885,829
• Publication Number:
  US 20020023385A1
• Time in Patent Office: 1,259 Days
• Field of Search: 47/576, 47/581.R, 47D/IG.9, 47D/IG.11, 71/5, 504/100
• US Class Current: 47/57.6
• CPC Class Codes: A01C 1/08 Immunising seed
• CPC Class Codes: A01N 2300/00 Combinations or mixtures of active ingredients covered by classes A01N27/00 - A01N65/48 with other active or formulation relevant ingredients, e.g. specific carrier materials or surfactants, covered by classes A01N25/00 - A01N65/48
• CPC Class Codes: A01N 63/20 Bacteria; Substances produced thereby or obtained therefrom
• CPC Class Codes: Y10S 47/09 Physical and chemical treatment of seeds for planting
• CPC Class Codes: Y10S 47/11 The application of protective coatings to plants

Abstract

For the purpose of obtaining disease-free seeds of high quality by efficiently controlling a seed borne disease of seeds of vegetable crops, ornamental plants and other herbage, seeds are subjected to a physical or chemical sterilization to reduce a fungal or bacterial amount held by the seeds and then the thus sterilized seeds are treated by an effective microorganism which is antagonistic against a pathogen of the seed borne disease. Controlling effect and fixing property of the effective microorganism can be enhanced by using a plurality of fungal or bacterial strains thereof. Examples of such effective microorganisms include fungi or bacteria belonging to the genus Pantoea or the genus Leclercia which is antagonistic against the pathogen belonging to the genus Xanthomonas.

Claims

1. A method of controlling a seed disease comprising the steps of:

sterilizing seeds by at least one of a physical technique and a chemical technique; and

treating the thus sterilized seeds by an effective plurality of types of microorganisms which are antagonistic against a pathogen of a seed borne disease, wherein at least one type of said effective microorganisms is a bacterium belonging to the genus Pantoea and at least one other type of said effective microorganisms is a bacterium belonging to the genus Leclercia, each of said types of microorganisms belonging to the genus Pantoea and the genus Leclercia being antagonistic against a pathogenic bacterium belonging to the genus Xanthomonas.

2. The method of controlling the seed disease according to claim 1, wherein at least one type of said effective microorganisms is a microorganism separated from seeds which have been obtained by seed production.

3. The method of controlling the seed disease, according to claim 1, wherein the seeds to be treated are those which have been contaminated with the pathogen of the seed borne disease.

4. The method of controlling the seed disease according to claim 1, wherein the thus treated seeds are those belonging to a family selected from the group consisting of the family Brassicaceae, the family Umbelliferae, the family Solanaceae, the family Cucurbitaceae, the family Compositae, the family Liliaceae, the family Chenopodiaceae and the family Leguminosae.

5. The method of controlling the seed disease according to claim 1, wherein said physical technique is a dry-heating treatment or a warm-water treatment.

6. The method of controlling the seed disease according to claim 1, wherein said chemical technique is a treatment selected from the group consisting of a soaking treatment, a powder-coating treatment, and a coating-treatment, and wherein all three treatments are performed using a synthetic agrochemical.

7. The method of controlling the seed disease according to claim 1, wherein a treatment by said effective microorganisms is performed such that the seeds are soaked in an aqueous dispersion of the effective microorganisms.

8. The method of controlling the seed disease according to claim 1, wherein a treatment by said effective microorganisms is performed such that the seeds are pelleted by a coating material containing the effective microorganisms.

9. The method of controlling the seed disease according to claim 1, wherein a treatment by said effective microrganisms is performed such that the seeds are film-coated by a coating solution containing the effective microorganisms.

10. The method of controlling the seed disease according to claim 1, wherein a treatment by said effective microorganisms is performed such that the seeds are allowed to absorb water by contacting a carrier impregnated with an aqueous dispersion of the effective microorganisms.

11. Seeds a disease of which has been controlled by treating the seeds by the method of claim 1.

12. The method of controlling the seed disease according to claim 1, wherein Pantoea sp. TK-185 (FERM BP-7618) is used as one of said effective microorganisms.

13. The method of controlling the seed disease according to claim 1, wherein Leclercia adecarboxylata TK-151 (FERM BP-7617) is used as one of said effective microorganisms.

14. The method of controlling the seed disease according to claim 1, wherein said seed disease is a seed borne disease selected from the group consisting of Alternaria Brassicae, Alternaria brassicicola, Peronospora brassicae, Pseudomonas syringae p.v. maculicola, Xanthomonas campestris p.v. campestris and Phoma lingam of the cabbage, Alternaria japonica, Alternaria brassicae, Fusarium oxysporum f.sp. raphani, Xanthomonas campestris p.v. campestris of the radish, Alternaria brassicae, Xanthomonas campestris p.v. campestris, Verticillium dahliae of the Chinese cabbage, Alternaria dauci, Alternaria radicina, Xanthomonas compestris p.v. carotae of the carrot, Septoria apii, Sclerotinia sclerotiorum, Pseudomonas syringae p.v. apii of the celery, Alternaria porri, Botrytis allii, Botrytis byssoidea, Fusarium oxysporum f. sp. cepae and Peronospora destructor of the onion, Peronospora farinosa, Fusarium oxysporum f. sp spinaciae, Colletotrichum dematium of the spinach, Alternaria solani, Clavibacter michiganensis subsp. michiganensis, Xanthomonas campestris p.v. vesicatoria of the tomato, Alternaria solani, Phomopsis vexans of the egg plant, Alternaria cucumerina, Pseudomonas syringae p.v. lachrymans, Xanthomonas campestris p.v. cucurbitae of the cucumber, Alternaria znniae, Xanthomonas campestris p.v. znniae of the common zinnia, Sclerotinia sclerotiorum, Alternaria helianti of the sun flower, and Xanthomonas campestris p.v. campestris of the ornamental kale.