Final part 2 Flashcards

1
Q

Haustoria-

A

Specialized absorption structures produced on parasitic plants

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

Epiphytes:

A

Physiologically dependent, no chlorophyll or leaves. Ex: Spanish moss

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

Holoparasites: .

A

Dependent entirely on host; biotroph. Small leaves, scales. Contains chlorophyll.

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

Hemiparasites: Dependent of host for water and minerals. Contains chlorophyll and leaves.

A

Dependent of host for water and minerals. Contains chlorophyll and leaves.

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

4 major groups of parasitic plants:

A
  1. Broomrapes, holoparasite. Host: sunflower.
  2. Dodder, holoparasite. Host: wide range of perennials.
  3. Witchweeds, hemiparasite. Host: corn.
  4. Mistletoe, hemiparasite. Leafy Host: Hardwoods. Dwarf host: conifers
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How are parasitic plants managed?

A

Protection: Provide adequate water and nutrients for host plant.
Avoidance: Choose planting sites where chance of parasite is low.
Exclusion: Impose quarantines.
Eradication: Herbicides, selective pruning, hand-pulling plants.

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

Trap crops:

A

: (example) host crop is planted to stimulate seed germination then plowed before weed germinate.

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

how is witch weed managed?

A

trap crops

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

Disease:

A

injurious and progressive; gets worse over time.

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

injury:

A

damage caused by transitory interaction with insect, chemical, or unfavorable environmental conditions

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

Winter burn:

A

 Or desiccation, rust occurring of evergreens caused by low soil moisture, freezing temperatures and harsh winds

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

Sunscald:

A

Winter time injury to tree trunks, caused by the sun—deciduous

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

Etiolation:

A

plants grown in the absence of light.

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

Which minerals are most likely to be toxic?

A

Boron, Manganese, Copper

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

What is acid rain/precipitation?

A

Air pollutants, such as sulfur and nitrogen oxides, react with H2O to form sulfuric and nitric acids

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

How does acid rain affect plant growth?

A

Causes chlorosis, defoliation, and stunting of trees- forest decline.

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

What causes injury due to herbicides?

A

Misapplication, spray drift, movement of water, and chemical residues.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

List three other causes of abiotic diseases

A

Excessive or deep cultivation, construction, girdling of trees by fence wire

19
Q

Immunity –

A

Freedom from attack and injury by pathogen

20
Q

Tolerance –

A

Ability of plant to survive effects of disease without suffering serious injury or great crop loss

21
Q

Escape –

A

Apparent resistance

22
Q

Constitutive (passive) defenses –

A

mechanisms are in place whether or not the pathogen is present; waxy cuticles

23
Q

Induced (active) defenses –

A

mechanisms develop in response to attempted entry and/or establishment of pathogen; cork layers

24
Q

o Tyloses –

A

form in xylem
Outgrowth of adjacent protoplasts
Plug xylem vessels and stop movement of pathogen

25
which types of pathogenss have all 3 types of variations?
parasitic plants fungi nematodes
26
Which types of pathogens have only mutation as a source of genetic variation?
bacteria and viruses
27
Pathogenicity –
ability of pathogen to cause disease in a plant species (virulence)
28
What is the gene-for-gene hypothesis?
“For each gene in the host capable of mutating to give resistance, there exists a gene in the pathogen capable of mutating to overcome that resistance.”
29
Mass Selection:
slow improvements, select seed of highly resistant plants in a field with natural disease infection.
30
Pure line or pedigree selection:
select highly resistant plants, propagate progency of each plant separately.
31
Recurrent selection or backcrossing:
desirable but susceptible cultivar is crossed with a resistant cultivar or wild relative.
32
Production of Hybrids: Cross two lines containing different genes for resistance.
Cross two lines containing different genes for resistance.
33
Marker-assisted selection:
Used with traditional breeding methods, use molecular biology to identify R genes on chromosomes
34
Genetic engineering:
Transfer of specific genes b/t organisms using enzymes and laboratory techniques instead of traditional biological crossing.
35
Name three methods of exclusion.
Quarantines, Pathogen-free seed, and pathogen-free propagative parts
36
Hypovirulence:
using a virus that infects pathogen, reducing its
37
Name four methods of reducing leaf wetness.
Fans, improve soil drainage, row orientation
38
Cross-protection:
inoculate with a mild strain of virus to protect against infection
39
inorganic fungicides are strictly ?
protective
40
2 common fungicides:
Captan and Bravo
41
Amphimobile:
phloem-mobile; move both upward and downward within plant.
42
What does FRAC stand for?
Fungicide Resistance Action Committee
43
What types of pathogens are killed by antibiotics?
Bacteria, mollicutes and some fungi.
44
Define integrated pest management
Combination of cultural, biological, physical and chemical controls.