Chapter 16 Flashcards
1
Q
Management of plant disease depends on whether the disease is biotic or abiotic
A
True
2
Q
The life cycle of a fungus can involve only one type of spore
A
False
3
Q
Mycelium is a symptom of fungal disease
A
False
4
Q
Scab is more likely to be a problem in dry, cool areas
A
False
5
Q
Smut can overwinter in soil, plant debris and seed
A
True
6
Q
Most fungal agents that cause post harvest diseases are introduced to the affected seed after harvest
A
False
7
Q
Bacterial wilt of alfalfa is less an issue today because of resistant varieties
A
True
8
Q
Plant pathogenic viruses are generally composed of DNA enclosed in a protein case
A
False
9
Q
Viruses can enter the plant through the stomata
A
False
10
Q
Fungi can transmit viruses to a plant
A
True
11
Q
A method to control viral diseases is the use of pesticides
A
False
12
Q
Insects that damage plants all have mouthparts that pierce
A
False
13
Q
Many bactericides are copper-based
A
True
14
Q
Contact insecticides, once absorbed by the insect, attack the nervous and respiratory system
A
True
15
Q
UG99 stem rust has the potential to threaten 20% of the worlds food supply
A
True
16
Q
The visual response by the plant to the pathogen is:
A. A symptom
B. A disease
C. An injury
D. An infection
A
A. A Symptom
17
Q
Which of the following is NOT an abiotic disease factor?
A. Parasitic Plant
B. Water Deprivation
C. Soil Acidity
D. Herbicide
A
A. Parasitic Plant
18
Q
Which of the following organisms reproduces by spores?
A. Bacterium
B. Virus
C. Fungus
D. Nematode
A
C. Fungus
19
Q
Rust disease are caused by which group of fungi?
A. Sclertinomycetes
B. Basidiomycetes
C. Fusariomycetes
D. Pythiomycetes
A
B. Bacidiomycetes
20
Q
Stem rust can have up to how many different spore stages?
A. Two
B. Three
C. Five
D. Seven
A
C. Five
21
Q
Damping off affected which growth stage?
A. Seedling
B. Flowering
C. Fruiting
D. Senescence
A
A. Seedling
22
Q
The disease associated with the Salem witch trials is:
A. Scab
B. Rust
C. Blast
D. Ergot
A
D. Ergot
23
Q
Leaf spots due to bacteria tend to be:
A. Round
B. Angular
C. Mosaic
D. Linear
A
B. Angular
24
Q
Bacterial wilts occur when the bacteria invade the:
A. Flowers
B. Leaves
C. Fruit
D. Vascular System
A
D. Vascular System
25
```
Common and halo blight affect which crop species?
A. Corn
B. Small Grains
C. Sugar Beets
D. Beans
```
D. Beans
26
```
Vein clearing is a symptom common in:
A. Viral Diseases
B. Bacterial Diseases
C. Plant Parasitic Diseases
D. Fungal Diseases
```
A. Viral Diseases
27
```
Which plant family does tobacco mosaic virus primarily infect?
A. Rose Family
B. Potato Family
C. Grass Family
D. Legume Family
```
B. Potato Family
28
```
Aster yellows is caused by which group of organisms?
A. Fungi
B. bacteria
C. Viruses
D. Mycoplasma-Like Organisms
```
D. Mycoplasma-like Organisms
29
```
Nematodes are a type of:
A. Insect
B. Roundworm
C. Fungi
D. Bacteria
```
B. Roundworm
30
```
The best strategy for nematode control would be:
A. Removal of Plant Debris
B. Seed Treatments
C. Fungicides
D. Crop Rotation
```
D. Crop Rotation
31
```
The soybean cyst nematode causes damage by:
A. Necrosis
B. Clogging Phloem
C. Feeding on Roots
D. Defoliating Leaves
```
C. Feeding on Roots
32
```
The corn ear worm feeds on what part of the corn?
A. Roots
B. Blades
C. Stems
D. Kernels
```
D. Kernels
33
```
A potential biocontrol being evaluated for use on soybean aphid is which of the following?
A. Bacillus thuringiensis
B. Binodoxys communis
C. Pyrausta nubilalis
D. Lepinotarsa decimilneata
```
B. Binodoxys communis
34
A ________ is the progressive deviation from a plant's normal development, appearance or function
Plant Disease
35
The three facts of the disease triangle are ________, ________, and _________
Pathogen, Host and Environment
36
Organisms that require living host tissue to obtain nutrients for survival are ________ parasites
Obligate
37
The disease-causing microorganisms that have both RNA and DNA but lack true cell walls are called __________ organisms
Mycoplasma-like
38
In the fields with nematode infestations, symptomatic plants grow in circular, localized areas called _______
Hot Spot
39
Parasitic flowering plants lack root systems and instead absorb water nutrients through organs called ________
Haustoria
40
The gradual developmental stages of an insect's life cycle from egg to adult is called _________
Metamorphosis
41
Insects can have one of the these three types of life cycles- ______ metamorphosis, _______ metamorphosis or _______ metamorphosis
No, Incomplete and Complete
42
____________ is the management strategy to keep pests at levels that will not cause economic loss
Integrated Pest Management
43
There are two general categories of fungicides- _______ and _________
Protestants and Systemics
44
The basic strategies of an IPM program can be categorized into five methods, which are _______, ______, _______, _______ and _______
Cultural, Biological, Mechanical and Chemical
45
Ergot
Claviceps purpurea
46
Rice Blast
Pyricularia grisea
47
Wheat Steam Rust
Puccinia graminis
48
Powdery Mildew
Erysiphe spp.
49
Head Blight of Wheat
Fusarium graminearum
50
Corn Smut
Ustilago maydis
51
Damping Off
Pythium spp.
52
Crown Gall
Agrobacterium tumefaciens
53
Halo Blight
Pseudomonas syringae pv. phaseoli
54
Bacterial Wilt of Alfalfa
Cornynebacterium insidiosum
55
Common Scab of Potato
Streptomyces scabies
56
Common Blight
Xanthomonas phaseoli
57
Aphid
Piercing and Sucking
58
Weevil
Chewing
59
Grasshopper
Chewing
60
Potato Leaf Hopper
Piercing and Sucking
61
Colorado Potato Beetle
Chewing
62
Sanitation
Cultural
63
Green Manures
Biological
64
Fungicide
Chemical
65
Tillage
Mechanical
66
Crop Rotation
Cultural
67
Irrigation
Cultural
68
Insecticide
Chemical
69
Resistant Cultivar
Genetic
70
Beneficial Insects
Biological
71
Handpicking
Mechanical
