Brainscape's Knowledge GenomeTM

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


See full index

Continuing Education > Agricultural Weed Management Principles > Flashcards

Agricultural Weed Management Principles Flashcards

1
Q

How many seed leaves do grasses have?

A

One

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

How many See leaves do broadleaf plants have?

A

Two

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

When do Summer Annual plants germinate?

A

Spring and Summer

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

When do Winter annual plants germinate?

A

Late Summer or Early Winter

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

How long does it take for Biennial plants to complete their life cycle?

A

Within two years

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Explain the life cycle of a biennial plant:

A

Year One the plant forms basal leaves and a tap root.

Year Two the plant flowers, matures and dies.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Are there any biennial grasses or sedges?

A

No

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

What is the rosette stage of plant growth?

A

When the plant forms basal leaves.

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

What are the two ways that perennial plants spread?

A

Simple or Creeping

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

Simple perennial plants spread by:

A

primarily by seed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Creeping perennial plants spread by:

A

Creeping roots, Stolons and Rhizomes

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

What are the different ways to mechanically control weeds?

A

Tilling, Mowing, Flooding, Fire, Mulching

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

Give examples of Cultural Control for weeds

A

Crop Competition
Crop Rotation
Nurse Crops
Irrigating Fields

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

How are herbicides applied so they can be absorbed through the plant?

A

Directly onto the plant

To the soil where the weed will emerge

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

to control annual and biennial weeds, what part of the plant does the herbicide need to kill?

A

the shoots

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

to kill perennial weeds, what part of the plant does the herbicide need to kill?

A

the roots

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

what is an important consideration when applying a contact herbicide?

A

you must have good coverage - the herbicide will only kill the vegetation that it touches.

18
Q

Will contact herbicides kill perennial plants?

A

No

19
Q

translocated herbicides are also called:

A

Systemic herbicides

20
Q

What can make a systemic herbicide less effective?

A

stressed plants that aren’t transporting sugars and water throughout their systems so the herbicide doesn’t move throughout the entire plant.

21
Q

what are some common systemic herbicides?

A

2,4-D, MCPA, Diuron, glyphosate, dicamba

22
Q

Residual Herbicides are also know as:

A

Pre-Emergent herbicides

23
Q

how many modes of action are there in herbicides?

A

7

24
Q

Name the herbicide Modes of Action:

A 
PGR
Amino Acid Synthesis Inhibitors
Lipid Inhibitors
Seedling Growth Inhibitors
Photosynthesis Inhibitors
Cell Membrane Disruptors
Pigment Inhibitors
25
Q

What do Amino Acid Synthesis inhibitors do?

A

prevent the production of amino acids that for proteins which are fundamental to plant development

26
Q

What MOA is glyphosate?

A

Amino Acid Inhibitor

27
Q

What do Lipid Inhibitors do?

A

Prevent the production of fatty acids that make cell membranes which are required for plant growth

28
Q

What do Seedling growth inhibitors do?

A

Stop seeding root and shoot development

29
Q

What do photosynthesis inhibitors do?

A

Interfere with photosynthesis

30
Q

Define Photosynthesis:

A

Conversion of Water and Carbon Dioxide to Sugar in the presence of Sunlight.

31
Q

What do Cell Membrane Disruptors do?

A

Destroy plant tissue by rupturing plant cell membranes

32
Q

What do pigment inhibitors do?

A

Prevent plants from forming chlorophyll

33
Q

What are the two groups of Herbicide Selectivity Factors:

A

Plant Factors

Chemical and Application Factors

34
Q

What are the two major factors that influence a herbicides performance?

A

Soil Factors

Climatic Factors

35
Q

What are the 4 growth stages of weeds?

A

Seedling, Vegetative, Flowering and Maturity

36
Q

What is the most effective time of year to apply herbicides to perennial weeds?

A

Summer or Fall when they are transporting sugars to their roots

37
Q

define Herbicide Tolerance:

A

When a plant has historically survived a particular herbicide action

38
Q

define Herbicides Susceptibility:

A

When a plant is killed by herbicide action

39
Q

define Herbicide Resistance:

A

When a plant has an evolved mechanism to survive a particular herbicide action

40
Q

What are the different ways that herbicides become less effective?

A 
Photodegradation - Sunlight
Microbial Degradation
Chemical Degradation
Adsorption to soil or OM
Leaching
Volatilization
Removal by Plants
pH
41
Q

To double the flow rate, you must increase the pressure (psi) by how much?

A

4 X

42
Q

How do you calculate the area of a circle?

A

radius squared x Pi (3.14)

Continuing Education (7 decks)

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