up and coming problem weeds in agronomic crops in albertadepartment/deptdocs.nsf/all/crop165… ·...
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UP AND COMING PROBLEM WEEDS IN ALBERTA
Nicole Kimmel
Weed Specialist
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WEEDY TRAITS
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INVASIVE ECOLOGY OF WEEDS
1965 BAKER’S LIST OF IDEAL CHARACTERISTICS OF
WEEDS
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Germinates in a wide range of environments.
0◦C
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Long-lived seeds that are internally controlled so that
germination is discontinuous.
100 years 600 years 1700
years
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Rapid growth from vegetative through flowering stage.
5 weeks
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Self-compatible, but not
completely. Cross pollination
(when present) by wind or generalist
insects.
Norm Boulet
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Seeds produced continuously throughout the growth period.
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Seed production occurs under a wide range of environmental
conditions.
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High seed output when
environmental conditions are
favorable.
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Seeds adapted to short and long distance dispersal.
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If perennial, has a high rate of vegetative reproduction or
regeneration from fragments.
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If perennial, stems fragment easily, so it is difficult to pull from
the ground.
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Strong potential to out compete other species via allelopathy, rosettes, rapid
growth, and other means.
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There are some weeds so noxious that, if
farmers knew their real character and recognized them on first appearance, they would postpone all other business until they
were destroyed.
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Canadian
Advice
from 1906
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TRENDS IN WEED IDENTIFICATION
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Kristian Peters
Marsh WillowHerb Epilobium palustre
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By Kenraiz - Krzysztof Ziarnek K bogusz1
Field Violet Viola arvensis
Alabama Plants
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Marsh Cudweed Gnaphalium uliginosum
Photos from Toby Newton
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Yellow Cress Rorippa palustris
All photos from Illinois Wildflowers
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Tumble Mustard Sisymbrium altissimum
Spokane Wildflowers
New England Wild Flower Society
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Nodding Thistle Carduus palustre
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The Kitchen Garden Blog 38 best Atriplex images on Pinterest
Garden Orach Atriplex hortensis
Baker Creek Heirloom Seeds