Chapter 16 Flashcards
Management of plant disease depends on whether the disease is biotic or abiotic
True
The life cycle of a fungus can involve only one type of spore
False
Mycelium is a symptom of fungal disease
False
Scab is more likely to be a problem in dry, cool areas
False
Smut can overwinter in soil, plant debris and seed
True
Most fungal agents that cause post harvest diseases are introduced to the affected seed after harvest
False
Bacterial wilt of alfalfa is less an issue today because of resistant varieties
True
Plant pathogenic viruses are generally composed of DNA enclosed in a protein case
False
Viruses can enter the plant through the stomata
False
Fungi can transmit viruses to a plant
True
A method to control viral diseases is the use of pesticides
False
Insects that damage plants all have mouthparts that pierce
False
Many bactericides are copper-based
True
Contact insecticides, once absorbed by the insect, attack the nervous and respiratory system
True
UG99 stem rust has the potential to threaten 20% of the worlds food supply
True
The visual response by the plant to the pathogen is: A. A symptom B. A disease C. An injury D. An infection
A. A Symptom
Which of the following is NOT an abiotic disease factor? A. Parasitic Plant B. Water Deprivation C. Soil Acidity D. Herbicide
A. Parasitic Plant
Which of the following organisms reproduces by spores? A. Bacterium B. Virus C. Fungus D. Nematode
C. Fungus
Rust disease are caused by which group of fungi? A. Sclertinomycetes B. Basidiomycetes C. Fusariomycetes D. Pythiomycetes
B. Bacidiomycetes
Stem rust can have up to how many different spore stages? A. Two B. Three C. Five D. Seven
C. Five
Damping off affected which growth stage? A. Seedling B. Flowering C. Fruiting D. Senescence
A. Seedling
The disease associated with the Salem witch trials is: A. Scab B. Rust C. Blast D. Ergot
D. Ergot
Leaf spots due to bacteria tend to be: A. Round B. Angular C. Mosaic D. Linear
B. Angular
Bacterial wilts occur when the bacteria invade the: A. Flowers B. Leaves C. Fruit D. Vascular System
D. Vascular System
Common and halo blight affect which crop species? A. Corn B. Small Grains C. Sugar Beets D. Beans
D. Beans
Vein clearing is a symptom common in: A. Viral Diseases B. Bacterial Diseases C. Plant Parasitic Diseases D. Fungal Diseases
A. Viral Diseases
Which plant family does tobacco mosaic virus primarily infect? A. Rose Family B. Potato Family C. Grass Family D. Legume Family
B. Potato Family
Aster yellows is caused by which group of organisms? A. Fungi B. bacteria C. Viruses D. Mycoplasma-Like Organisms
D. Mycoplasma-like Organisms