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Crops > Chapter 16 > Flashcards

Chapter 16 Flashcards

1
Q

Management of plant disease depends on whether the disease is biotic or abiotic

A

True

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2
Q

The life cycle of a fungus can involve only one type of spore

A

False

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3
Q

Mycelium is a symptom of fungal disease

A

False

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4
Q

Scab is more likely to be a problem in dry, cool areas

A

False

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5
Q

Smut can overwinter in soil, plant debris and seed

A

True

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6
Q

Most fungal agents that cause post harvest diseases are introduced to the affected seed after harvest

A

False

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7
Q

Bacterial wilt of alfalfa is less an issue today because of resistant varieties

A

True

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8
Q

Plant pathogenic viruses are generally composed of DNA enclosed in a protein case

A

False

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9
Q

Viruses can enter the plant through the stomata

A

False

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10
Q

Fungi can transmit viruses to a plant

A

True

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11
Q

A method to control viral diseases is the use of pesticides

A

False

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12
Q

Insects that damage plants all have mouthparts that pierce

A

False

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13
Q

Many bactericides are copper-based

A

True

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14
Q

Contact insecticides, once absorbed by the insect, attack the nervous and respiratory system

A

True

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15
Q

UG99 stem rust has the potential to threaten 20% of the worlds food supply

A

True

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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

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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

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18
Q 
Which of the following organisms reproduces by spores? 
        A. Bacterium 
        B. Virus 
        C. Fungus 
        D. Nematode
A

C. Fungus

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19
Q 
Rust disease are caused by which group of fungi? 
        A. Sclertinomycetes
        B. Basidiomycetes
        C. Fusariomycetes
        D. Pythiomycetes
A

B. Bacidiomycetes

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20
Q 
Stem rust can have up to how many different spore stages? 
        A. Two 
        B. Three 
        C. Five 
        D. Seven
A

C. Five

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21
Q 
Damping off affected which growth stage? 
        A. Seedling 
        B. Flowering 
        C. Fruiting 
        D. Senescence
A

A. Seedling

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22
Q 
The disease associated with the Salem witch trials is: 
        A. Scab 
        B. Rust 
        C. Blast 
        D. Ergot
A

D. Ergot

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23
Q 
Leaf spots due to bacteria tend to be: 
        A. Round 
        B. Angular 
        C. Mosaic 
        D. Linear
A

B. Angular

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24
Q 
Bacterial wilts occur when the bacteria invade the: 
        A. Flowers 
        B. Leaves 
        C. Fruit 
        D. Vascular System
A

D. Vascular System

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25
Q 
Common and halo blight affect which crop species? 
        A. Corn 
        B. Small Grains 
        C. Sugar Beets 
        D. Beans
A

D. Beans

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26
Q 
Vein clearing is a symptom common in: 
        A. Viral Diseases 
        B. Bacterial Diseases 
        C. Plant Parasitic Diseases 
        D. Fungal Diseases
A

A. Viral Diseases

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27
Q 
Which plant family does tobacco mosaic virus primarily infect? 
        A. Rose Family 
        B. Potato Family 
        C. Grass Family 
        D. Legume Family
A

B. Potato Family

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28
Q 
Aster yellows is caused by which group of organisms? 
        A. Fungi 
        B. bacteria 
        C. Viruses 
        D. Mycoplasma-Like Organisms
A

D. Mycoplasma-like Organisms

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29
Q 
Nematodes are a type of: 
        A. Insect 
        B. Roundworm 
        C. Fungi 
        D. Bacteria
A

B. Roundworm

30
Q 
The best strategy for nematode control would be: 
        A. Removal of Plant Debris 
        B. Seed Treatments 
        C. Fungicides 
        D. Crop Rotation
A

D. Crop Rotation

31
Q 
The soybean cyst nematode causes damage by: 
        A. Necrosis 
        B. Clogging Phloem 
        C. Feeding on Roots 
        D. Defoliating Leaves
A

C. Feeding on Roots

32
Q 
The corn ear worm feeds on what part of the corn? 
        A. Roots 
        B. Blades 
        C. Stems 
        D. Kernels
A

D. Kernels

33
Q 
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
A

B. Binodoxys communis

34
Q

A ________ is the progressive deviation from a plant’s normal development, appearance or function

A

Plant Disease

35
Q

The three facts of the disease triangle are ________, ________, and _________

A

Pathogen, Host and Environment

36
Q

Organisms that require living host tissue to obtain nutrients for survival are ________ parasites

37
Q

The disease-causing microorganisms that have both RNA and DNA but lack true cell walls are called __________ organisms

A

Mycoplasma-like

38
Q

In the fields with nematode infestations, symptomatic plants grow in circular, localized areas called _______

39
Q

Parasitic flowering plants lack root systems and instead absorb water nutrients through organs called ________

40
Q

The gradual developmental stages of an insect’s life cycle from egg to adult is called _________

A

Metamorphosis

41
Q

Insects can have one of the these three types of life cycles- ______ metamorphosis, _______ metamorphosis or _______ metamorphosis

A

No, Incomplete and Complete

42
Q

____________ is the management strategy to keep pests at levels that will not cause economic loss

A

Integrated Pest Management

43
Q

There are two general categories of fungicides- _______ and _________

A

Protestants and Systemics

44
Q

The basic strategies of an IPM program can be categorized into five methods, which are _______, ______, _______, _______ and _______

A

Cultural, Biological, Mechanical and Chemical

45
Q

Ergot

A

Claviceps purpurea

46
Q

Rice Blast

A

Pyricularia grisea

47
Q

Wheat Steam Rust

A

Puccinia graminis

48
Q

Powdery Mildew

A

Erysiphe spp.

49
Q

Head Blight of Wheat

A

Fusarium graminearum

50
Q

Corn Smut

A

Ustilago maydis

51
Q

Damping Off

A

Pythium spp.

52
Q

Crown Gall

A

Agrobacterium tumefaciens

53
Q

Halo Blight

A

Pseudomonas syringae pv. phaseoli

54
Q

Bacterial Wilt of Alfalfa

A

Cornynebacterium insidiosum

55
Q

Common Scab of Potato

A

Streptomyces scabies

56
Q

Common Blight

A

Xanthomonas phaseoli

57
Q

Aphid

A

Piercing and Sucking

58
Q

Weevil

59
Q

Grasshopper

60
Q

Potato Leaf Hopper

A

Piercing and Sucking

61
Q

Colorado Potato Beetle

62
Q

Sanitation

63
Q

Green Manures

A

Biological

64
Q

Fungicide

65
Q

Tillage

A

Mechanical

66
Q

Crop Rotation

67
Q

Irrigation

68
Q

Insecticide

69
Q

Resistant Cultivar

70
Q

Beneficial Insects

A

Biological

71
Q

Handpicking

A

Mechanical

Crops (14 decks)

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