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Canada thistle . Scientific name: Cirsium arvense Family: Asteraceae Life cycle: Perennial Where found: Range, Cropland Physical description: Seed: light brown, 3-4mm long, with feathery white plume Cotyledon: oval to oblong, visible white midvein

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canada thistle
Canada thistle
  • Scientific name: Cirsiumarvense
  • Family: Asteraceae
  • Life cycle: Perennial
  • Where found: Range, Cropland
  • Physical description:
    • Seed: light brown, 3-4mm long, with feathery white plume
    • Cotyledon: oval to oblong, visible white midvein
    • True leaves oval to elliptic in shape, with dentate to deeply pinnate margins
      • Forms a basal rosette at first, then alternate when flowering
    • Leaves sessile; prickly and spine-tipped with a waxy surface
    • Purplish-pink flowers less than 2.5cm across
  • Interesting facts:
    • Primarily reproduces by extensive creeping rhizomes
      • the only rhizomatous thistle
    • Female flowers have a pleasant, vanilla-like aroma
    • Latin name describes distinct midvein of leaf
      • Cirsium = swollen vein
field bindweed
Field bindweed
  • Scientific name: Convolvulus arvensis
  • Family: Convolvulaceae (Morning Glory family)
  • Life cycle: Perennial
  • Where found: Range, Cropland
  • Physical description:
  • Seed: dark grey to reddish brown, three-sided
  • Cotyledon: linear to oblong
  • True leaves heart-shaped becoming arrowhead-shaped
    • Often confused with wild buckwheat
      • Similar leaf shape, arrangement alternate, petiolate leaves
      • Nodes of wild buckwheat have papery sheath, absent on field bindweed
      • Wild buckwheat has inconspicuous flowers, field bindweed has large white-pink, funnel-shaped flowers
      • Wild buckwheat leaf bases point in, field bindweed bases point outward
  • Growth habit: climbing/creeping, rhizomatous
  • Interesting facts:
    • Will host viruses affecting potatoes and tomatoes

Wild buckwheat

Field bindweed

slide4

Prevention

  • Cultural
  • Mechanical
  • Biological
  • Chemical
questions
Questions!
  • Crop scouting is considered a preventative control. True or False?
  • Which of the following types of weed management is currently the least effective?
      • Cultural
      • Mechanical
      • Biological
      • Chemical
  • Is mulching an example of mechanical weed control? Why or why not?