Weeds L1 Flashcards
what does it mean when it says stressors can have a synergistic effect
the overall effect is greater than the sum of the individual effects
principles of pest management
- identify the pest
- understand the biology and ecology of the pest
- assessment of infestation
- pest management strategies
what major modern advances have significantly increased food production
the introduction of mineral fertilizers, agricultural mechanization, genetic research, the use of pesticides and plant growth regulators
how many farm operators in 2021
262,455
population in Canada in 2021
36,991,981
____% of people produce all the food in Canada
0.71
ecosystem
a community of living organisms interacting with each other and their non-living environment
shared weed characteristics
long seed life in the soil
no special environment requirements for seed germination
quick emergence
rapid early growth
what is the most costly category of agricultural pests
weeds
estimated losses due to weed interference
Canada - $1-1.2 billion/year
Western Canada - 8-900 million
Eastern Canada - 250-300 million
Why are weeds troublesome
cost, competition for resources, allelopathy, hinder crop growth/development, host pests, promote disease, interfere with harvest, harmful health effects to humans
giant hogweed
causes huge blisters
benefits from weeds
protect from soil erosion
replenish organic matter
feed and restore soil life
absorb carbon dioxide from the atmosphere
restore biodiversity/provide habitat
absorb, conserve, and recycle soluble nutrients
what kind of plant are weeds
angiosperms
what does the definition of a weed depend on
person-place-time
