Final - Section 1 Flashcards
Why do Fungi have two names?
Name for the sexual (teleomorph) form Name for the asexual (anamorph) form
How can tell if the plant problem is due to abiotic or biotic factors?
Biotic – living, irregular patterns
Abiotic – non living, visible patterns
Define Symptom:
Observable condition of the abnormal physiology Affect on host
Define sign:
Physical presence of causal agent
List 4 biotic causal agents:
Fungi Bacteria Nematodes Virus
What is the most important step in diagnosing disease problems?
Send a Plug to the Lab
Define Plant Disease:
a condition of abnormal physiology in a susceptible host plant that is a result of the plants constant association with a disease causing agent within a set of favorable environmental conditions.
List the three groups of abiotic causal agents.
Chemical
Physical
Mechanical
Draw and Label the Plant Disease Triangle
HOST
ENVIRONMENT
PATHOGEN
define predisposition:
Environmental Conditions required by a pathogen to become active (proper temp., moisture, etc.)
define fungistat:
A substance that inhibits the growth of fungi
Define synergism
two or more agents working together to produce a result not obtainable by any of the agents independently
how can fungicide resistance be avoided?
Rotate Mode of Action
define Virulence.
Measure of efficacy
what 3 weeds are good hosts for Scleropthora macrospora?
- Crabgrass
- Quackgrass
- Orchardgrass
name a primary host of Powdery Mildew.
KBG
draw and label 5 fruiting bodies that produce conidia.
.
What are the environmental perameters used to predict Pythium Blight?
Hot Weather
- +85 deg. day & +70 deg. night
Extended Leaf Wetness
- +90% RH for > 10 hours
- poor air circulation
- shade
What are the environmental perameters used to predict Pythium Root Rot?
- Cool to Hot weather
-
Excess Soil Moisture
- Poor Drainage
- Compaction
- Shade
- Poor Air Circulation
What are the environmental perameters used to predict Pythium Root Dysfunction?
-
Root infecions occurs in Fall or Spring
- 50 - 75 deg Soil Temperatures
- Roots dies in summer from heat and drought stress
What is the cause of Stem Rust?
Puccinia graminis
What is the cause of Stripe Rust?
Puccinia striiformis
What is the cause of Crown Rust?
Puccinia coronata
What is Heteroecious Rust?
a rust that has 2 alternate hosts
(Think hetero….2)
