Weeds Flashcards
What is meant by a weed?
A plant of any kind growing out of place.
Name 3 ways weeds cause problems.
Reduction of plant growth and crop productivity as there is competition for water, light and nutrients.
Reduction of visual appeal of planting
Can be alternate hosts of pests and diseases e.g. White blister rust and club root.
What is meant by ephemeral weeds?
And give 2 examples
Has several life cycles in one growing season
E.g. Cardamine hirsuta (hairy bitter dress)
Capsella bursa-pastoris (shepherds purse)
State what is meant by an annual weed
Complete their life cycle within one year.
E.g. poa annua
Veronica persica (speedwell)
State what is meant by perennial weed and name 2 examples
Lives through several growing seasons or has a life cycle of more than 2 years.
E.g. Ranunculus repens
Aegopodium podagraria (ground elder)
State 2 weeds associated with recently cultivated soil
Cardamine hirsuta and Veronica persica
State 2 weeds associated with herbaceous borders
Any 2
State 2 weeds associated with woody perennial plantings
Ground elder Aegopodium podagraria
Stinging nettles?
State 2 weeds associated with lawns
Poa annua
Ranunculus repens
What is meant by contact herbicides?
Name one and its active ingredient.
Name a situation for its use.
Kill or damage plants where they enter.
Weedol - acetic acid
Clearing paths and patios.
State what is meant by translocated or systemic herbicides.
Name one
Where it could be used appropriately.
Absorbed by the plant and distributed around all parts of plant so good for perennial weeds.
Glyphosate (roundup)
Clearing uncultivated ground.
State what is meant by selective herbicides
Name one
Where best used.
Able to kill chosen weed species and leave others unaffected.
2 4-D - hormone based.
Works on broad leaved weeds in lawns
Binomial name for bindweed
Calystegia sepum
Name for ground elder
Aegopodium agraria
Name a contact herbicide and its ingredient
Weedol - Acetic Acid
diquat
