Abstract: In exemplary embodiments, the disclosure provides weed-suppressive Pseudomonas fluorescens strains effective for controlling one or more invasive grass weeds that are members selected from the group consisting of downy brome (cheatgrass, Bromus tectorum L.), medusahead (Taeniatherum caput medusae (L.) Nevski) and jointed goatgrass (Aegilops cylindrica L.). In exemplary embodiments, the weed-suppressive Pseudomonas fluorescens bacterial strain is a member selected from the group consisting of: Pseudomonas fluorescens strain ACK55, Pseudomonas fluorescens strain NKK78 and Pseudomonas fluorescens strain SMK69. In still other exemplary embodiments the disclosure provides methods for selecting weed-suppressive Pseudomonas fluorescens strains.

Abstract: In exemplary embodiments, the disclosure provides weed-suppressive Pseudomonas fluorescens strains effective for controlling one or more invasive grass weeds that are members selected from the group consisting of downy brome (cheatgrass, Bromus tectorum L.), medusahead (Taeniatherum caput medusae (L.) Nevski) and jointed goatgrass (Aegilops cylindrica L.). In exemplary embodiments, the weed-suppressive Pseudomonas fluorescens bacterial strain is a member selected from the group consisting of: Pseudomonas fluorescens strain ACK55, Pseudomonas fluorescens strain NKK78 and Pseudomonas fluorescens strain SMK69. In still other exemplary embodiments the disclosure provides methods for selecting weed-suppressive Pseudomonas fluorescens strains.

Abstract: In exemplary embodiments, the disclosure provides weed-suppressive Pseudomonas fluorescens strains effective for controlling one or more invasive grass weeds that are members selected from the group consisting of downy brome (cheatgrass, Bromus tectorum L.), medusahead (Taeniatherum caput medusae (L.) Nevski) and jointed goatgrass (Aegilops cylindrica L.). In exemplary embodiments, the weed-suppressive Pseudomonas fluorescens bacterial strain is a member selected from the group consisting of: Pseudomonas fluorescens strain ACK55, Pseudomonas fluorescens strain NKK78 and Pseudomonas fluorescens strain SMK69. In still other exemplary embodiments the disclosure provides methods for selecting weed-suppressive Pseudomonas fluorescens strains.

Abstract: A biocontrol agent containing one or more novel and isolated Pseudomonas fluorescens strains (P. fluorescens biovar B strain XJ3 (NRRL B-50851), P. fluorescens biovar B strain XS18 (NRRL B-50852), and P. fluorescens biovar A strain LRS 12 (NRRL B-50853)) and a biocontrol agent containing one, two or three of these bacteria with an agriculturally acceptable carrier are useful for the control of annual bluegrass and rough bluegrass root growth and germination. The biocontrol agents of this invention may be applied to the soil and/or seeds in the fall with inhibition occurring in subsequent years. The biocontrol agent can also be used in combination with herbicides that can inhibit the growth and seed production of any standing annual bluegrass and/or fertilizer to stimulate growth of the desirable plant that will compete with the annual bluegrass weed and/or rough bluegrass. Methods for use of these biocontrol agents to control to growth of annual bluegrass and rough bluegrass are also provided.

Abstract: A biocontrol agent containing one or more novel and isolated Pseudomonas fluorescens strains (P. fluorescens biovar B strain XJ3 (NRRL B-50851), P. fluorescens biovar B strain XS18 (NRRL B-50852), and P. fluorescens biovar A strain LRS12 (NRRL B-50853)) and a biocontrol agent containing one, two or three of these bacteria with an agriculturally acceptable carrier are useful for the control of annual bluegrass and rough bluegrass root growth and germination. The biocontrol agents of this invention may be applied to the soil and/or seeds in the fall with inhibition occurring in subsequent years. The biocontrol agent can also be used in combination with herbicides that can inhibit the growth and seed production of any standing annual bluegrass and/or fertilizer to stimulate growth of the desirable plant that will compete with the annual bluegrass weed and/or rough bluegrass. Methods for use of these biocontrol agents to control to growth of annual bluegrass and rough bluegrass are also provided.

Abstract: In exemplary embodiments, the disclosure provides weed-suppressive Pseudomonas fluorescens strains effective for controlling one or more invasive grass weeds that are members selected from the group consisting of downy brome (cheatgrass, Bromus tectorum L.), medusahead (Taeniatherum caput medusae (L.) Nevski) and jointed goatgrass (Aegilops cylindrica L.). In exemplary embodiments, the weed-suppressive Pseudomonas fluorescens bacterial strain is a member selected from the group consisting of: Pseudomonas fluorescens strain ACK55, Pseudomonas fluorescens strain NKK78 and Pseudomonas fluorescens strain SMK69. In still other exemplary embodiments the disclosure provides methods for selecting weed-suppressive Pseudomonas fluorescens strains.

Abstract: Methods to determine the geographic sources of soil samples are described. A biological fingerprint profile of the sample is determined. The profile is compared to a library which is constructed of datasets which relate biological profiles and geographic locations of soil samples. The invention provides a tool for identification of pollution sources of soil origin.

Abstract: A method for screening bacteria to select strains which inhibit the weed jointed goatgrass in small grain crops under field conditions and methods for field application of the bacteria to inhibit jointed goatgrass in small grain crops in a commercial setting are described. Strains useful for biocontrol of jointed goatgrass are disclosed.

Abstract: A method for screening bacteria to select strains which inhibit the weed downy brome in small grain crops under field conditions and method for field application of the bacteria to inhibit downy brome in small grain crops in a commercial setting are described. Three Pseudomonas strains initially determined as non-fluorescent which passed the screen test are disclosed.