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.
True
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 postharvest diseases are introduced to the affected seed after harvest.
False
Bacterial wilt of alfalfa is less an issue today because 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 world’s food supply.
True
