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Definition of Canada thistle in English: Canada thistlenoun North American The European creeping or field thistle, which has become naturalized as a serious weed in North America. 〈北美〉田蓟 Cirsium arvense, family Compositae Example sentencesExamples - Under growth-chamber conditions, mite populations on a Canada thistle plant can reach very high levels, causing severe damage to the plant.
- Fields with quackgrass, Canada thistle, and other cool-season perennial weeds will almost always require the use of glyphosate around the time of planting.
- The larvae of the painted lady butterfly - the thistle caterpillar - have been drawing a large amount of attention from anyone who has observed Canada thistle patches this spring.
- Tillage with a chisel plow, disk, or field cultivator may actually help spread perennials with creeping root systems, such as Canada thistle and hemp dogbane.
- Perennial grasses such as bluegrass and quackgrass and broadleaves such as Canada thistle, bindweed, and curly dock also could be addressed with the weed control program.
- In particular, perennial broadleafs and grasses such as dandelion, curly dock, Canada thistle, and quackgrass are much easier to manage prior to planting a forage crop.
- Perennials such as Canada thistle, hoary vervain, ironweed, goldenrod, and curly dock generally respond better to fall applications when the plant energy reserves are translocated down to the roots.
- Occasionally, broadleaf weeds, such as Canada thistle or ragweed, become established in winter wheat fields and interfere with grain harvest or with the following soybean crop.
- As agriculture expanded onto the prairies, wild oats and sow thistle, leafy spurge and Canada thistle migrated westward.
- The weeds that appear above the wheat canopy late in the season, such as ragweeds and Canada thistle, can often be easily controlled with a spring herbicide treatment.
- A search is under way for viral-infected Canada thistle plants in the areas where they were once reported - Denmark, England, and North Dakota.
- Avoid tilling overly aggressive or invasive plants that produce root-buds, such as crabgrass, johnsongrass, bindweed or Canada thistle.
- Herbaceous perennials, such as quackgrass, mugwort, and Canada thistle, die back to the ground each year.
- Smartweed often grows in potassium-poor soil, while Canada thistle suggests low magnesium levels.
Definition of Canada thistle in US English: Canada thistlenoun North American The European creeping or field thistle, which has become naturalized as a serious weed in North America. 〈北美〉田蓟 Cirsium arvense, family Compositae Example sentencesExamples - Occasionally, broadleaf weeds, such as Canada thistle or ragweed, become established in winter wheat fields and interfere with grain harvest or with the following soybean crop.
- Tillage with a chisel plow, disk, or field cultivator may actually help spread perennials with creeping root systems, such as Canada thistle and hemp dogbane.
- In particular, perennial broadleafs and grasses such as dandelion, curly dock, Canada thistle, and quackgrass are much easier to manage prior to planting a forage crop.
- Avoid tilling overly aggressive or invasive plants that produce root-buds, such as crabgrass, johnsongrass, bindweed or Canada thistle.
- The weeds that appear above the wheat canopy late in the season, such as ragweeds and Canada thistle, can often be easily controlled with a spring herbicide treatment.
- Perennials such as Canada thistle, hoary vervain, ironweed, goldenrod, and curly dock generally respond better to fall applications when the plant energy reserves are translocated down to the roots.
- Smartweed often grows in potassium-poor soil, while Canada thistle suggests low magnesium levels.
- The larvae of the painted lady butterfly - the thistle caterpillar - have been drawing a large amount of attention from anyone who has observed Canada thistle patches this spring.
- As agriculture expanded onto the prairies, wild oats and sow thistle, leafy spurge and Canada thistle migrated westward.
- Perennial grasses such as bluegrass and quackgrass and broadleaves such as Canada thistle, bindweed, and curly dock also could be addressed with the weed control program.
- Fields with quackgrass, Canada thistle, and other cool-season perennial weeds will almost always require the use of glyphosate around the time of planting.
- Herbaceous perennials, such as quackgrass, mugwort, and Canada thistle, die back to the ground each year.
- A search is under way for viral-infected Canada thistle plants in the areas where they were once reported - Denmark, England, and North Dakota.
- Under growth-chamber conditions, mite populations on a Canada thistle plant can reach very high levels, causing severe damage to the plant.
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