Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Weeds > Intro > Flashcards

Intro Flashcards

1
Q

What is IWM

A

Sustainable management system that combines all appropriate control options

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Where are weeds from?

A

Mainly introduced 85% alien

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Cost of weeds

A
  1. 3 billiom

2. 76 million tonnes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Effects of weeds

A 
Yield loss
Animal health/poisons
Aestetics
Contamination of produce
Harbour pests and disease
Inhaibit human activities
Aquatic enviro hazards
Fire
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Benefits of weeds

A 
Animal feed
Ground cover
Erosion and salintiy control
Accumulate OM
Biodiversity
herbs and medicines- St john wart
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Ideal Weeds

A 
No special germ required
Dormancy
Seed dispersal high
Cross and self pollination
Rapid growth
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How many weeds

A

8000

200 cause 90% of problems

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Several short life cycles in one year

A

Ephemeral Repropduction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

2 year life cyce

A

Biennial

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Asexual repro types

A 
Perennials and aquatics
Stems 
roots
stolons
runners
adventitious buds on leaves
Rhizomes
Tubers
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Positives of Asexual repro

A

Quicker establishment
More rapid and sustained early growth
Plants are naturally site selective

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Negatives of Asexual repro

A

Produced in lower numbers
Short range spread
Absence of genetic diversity
Vulpia, wild oats, summer grass

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Sexual Reproduction - Cross pollination

A 
Increase genetic variation
Relies on wind and insects
Traits outcrossed
Wild raddish
Ryegrass
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Sexual repro Self pollination

A

More stable gene pool

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Dispersal mechanism

A

Wind, water, plants, humans, soil, birds, seeds for sowing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Requirements for germination

A

Water
Temp
Oxygen

17
Q

DOMANCY

A

Mature seed- viable but wont germinate

Long term survival mechanism

18
Q

Enforced Dormancy

A

Environmental condidtions unfavourable

Lacking water, temo, oxygen

19
Q

Innate Dormancy- 3 types

A

Hard seed coat- clover
Immature Embryo - isn’t fully functioning
Embryo dormancy

20
Q

How to break innate dormancy

A

Fire, time, light, temp fluctuations, vernalisaiton, remover shemical inhibitors

21
Q

Manipulation seed bank techniques

A 
Cut off seed
Plough
Flood
Burn
Bail straight off header
22
Q

Invasion Window step 1

A

Potential invaders present

23
Q

Potential Invaders present

A

Proximity
Primary Dispersal - Plant to ground
Secondary Dispersal - ground to elsewhere
Jumped dispersal

24
Q

Invasion Window step 2

A

Disturbance

Fire, sowing, grazing, weather disturbance

25
Q

Increased weeds density equals

A

Dec. seeds per plant
Inc Mortality
Inc seeds removed

26
Q

What is long term effectiveness of weed control

A

Speed and which weed pop recovers

Weeds (12 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions