Plant Diseases Flashcards
Plant damage or loss of yield caused by an infectious agent or stress that affects the host
Plant disease
Infectious agents that cause plant diseases
Pathogens
Taking steps to prevent pathogens from moving into certain areas. It can include informal and formal (regulatory) inspections and barriers.
Exclusion
Removing pathogens from an area once they have entered. It can include destroying and removing plants as well as a range of sanitation steps.
Eradication
The ability of a plant to avoid infection or reduce the impact of infection based on genetic factors.
Resistance
Physical evidence of a pathogen, which can be the pathogen itself (white powdery mildew, bacterial ooze) or a combination of plant tissue and the pathogen (canker).
Sign
Which of the following is NOT a part of the disease triangle?
A. Pathogen
B. Resistance
C. Environment
D. Host
E. Disease
B.
True or False: Protection as a disease control strategy is limited to chemical or biological control agents.
False
Which of the following is NOT an example of eradication of plant diseases?
A. Crop rotation
B. Solarization
C. Inspection at a port of entry
D. Fumigation
C.
Which of the following are ways that plants can be protected from diseases?
A. Fungicide sprays
B. Ensuring proper soil drainage
C. Managing soil pH
D. Applying fertilizers
E. All of the above
E.
Order these steps of disease diagnosis: ID the host, look for signs and symptoms, determine what plant parts are affected, imagine a healthy plant, document the signs and symptoms and/or collect a sample, consider both living and non-living potential causes, search for disease diagnosis information
- ID host
- Imagine healthy plant
- Determine plant parts affected
- Look for signs and symptoms of disease
- Consider living and non-living potential causes.
- Document signs and symptoms and/or collect a sample
- Search for disease diagnosis information
These are often found on branches (or trunks) of trees and are usually caused by fungi that may not be easily detected in the early stages. It often leads to leaf and twig dieback and sunken area that can kill the branch or plant.
Cankers
These look like yellow white, red or gray blisters on leaves. They are a disease that can often be confused with similar structures caused by insects or mites.
Galls
A fungal pathogen that can be identified by the white to grapy mycelium on infected leaves or flowers.
Powdery mildew
As the name implies, this pathogen produces gray to brown growth that can infect leaves, flowers, and stems and is brought on by cool, moist conditions. It is common in greenhouses.
Gray mold
