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  1. Russian knapweed (Rhaponticum repens)

    https://pested.osu.edu/node/419

    allelopathic. The problem is…Russian knapweed persists in cultivated fields when established and produces deep ...

  2. Wild parsnip (Pastinaca sativa)

    https://pested.osu.edu/node/413

    and in abandoned fields. Leaf: Alternate, pinnately compound, leaflets are oval to oblong, hairless ...

  3. Noxious Weeds

    https://pested.osu.edu/EducatorResources/noxious-weeds

    grass (Sorghum x almun) Cressleaf groundsel (Senecio glabellus)  Field bindweed (Convolvulus arvensis) ...

  4. Palmer amaranth (Amaranthys palmeri)

    https://pested.osu.edu/node/408

    Habitat: Native grasslands, pastures, fields, disturbed areas, waste areas, open woods, meadows, and ...

  5. Mile-a-minute weed (Polygonum perfoliatum)

    https://pested.osu.edu/node/406

    wetlands, stream banks, roadsides and uncultivated open fields. Leaf: Alternate, waxy, light green colored ...

  6. Marestail (Conyza canadensis)

    https://pested.osu.edu/node/405

    orchards, fallow fields, waste areas and roadsides. Leaf: Mature plants have leaves that are entirely ...

  7. Russian thistle (Salsola Kali var. tenuifolia)

    https://pested.osu.edu/node/411

    Cultivated, fields, roadsides, railroad right-of ways, pastures, waste areas, irrigated areas, river bottoms, ...

  8. Poison hemlock (Conium maculatum)

    https://pested.osu.edu/node/409

    to most soils and is often found near roadsides. Field borders, hiking trails, railroad tracks, ...

  9. Musk thistle (Carduus nutans)

    https://pested.osu.edu/node/407

    waste places, ditch banks, old fields and old pastures. Leaf: Spiny dark green coarsely lobed leaves ...

  10. Canada Thistle (Cirsum arvense)

    https://pested.osu.edu/node/397

    roots Habitat: Grows in barrens, glades, meadows, fields, pastures, and waste places. It does best in ...

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