Pathogens Flashcards
Seed pathogen
D. sapinea
Xylem pathogen
X. fastidiosa
flower pathogen
U. virens
fruit pathogen
A. tenuis
fruit pathogen
B. cinerea
leaf pathogen
P. triticina
root and root crop pathogen
Phytophthora sp.
stem pathogen
S. sclerotiorum
viroid pathogen
Potato spindle tuber viroid (PSTVd)
characteristics of D. sapinea
Infection - seed cone blight
Colonization - by growing and spreading through infected needles
Spread - tree to tree esp. in wet conditions
Symptoms - 4Ds - Damping off and root
rot of seedlings
- Decay
- Discoloration
- Death of seedling
characteristics of X. fastidiosa
Spread - plant to plant through vectors
Ability - block the xylem vessels
Control Strategies - Insecticide for vector
- Removal and
destruction of infected plants
- Quarantine
Alternative Strategies - Breed resistant
plant varieties
- Utilizing bio.
control agents
characteristics of U. virens
Inhibits - pollen germination and tube elongation
Invade - both pistil and stamen
- Digests integuments
- Not a systemic pathogen
Characteristics of A. tenuis
- major mycotoxin
Causes - fruit rot (black spots)
- blights
Location - moist warm environment
Infection - Wound, natural openings, insect damage
Spread - fruit to fruit through spores
Characteristics of B. cinerea
Causes - grey mold on fruits
Spread - wind, water, insects through spores
Location - worldwide esp. moist warm environment
Infection - Wound, senescence, stressed by environmental factors
Characteristics of P. triticina
Primary Host - common wheat, durum wheat, cultivated and wild emmer wheat, etc.
Alternative host - meadow rue
Life cycle - Asexual and sexual stage
Infection - stomata
Spread - only through its hosts; due to it struggling to infect other plants
Characteristics of Phytophthora sp.
Requirements - warm and moist soil
Hosts - potato, tomato, etc.
Causes - root rot, blight, leather rot, etc.
Life cycle - direct and indirect germination
- sexual and asexual stage
Characteristics of S. sclerotiorum
Hosts - lettuce, cabbage, sunflower, etc.
Infection - nodes; watery lesions (brown)
- lesions expand (grey-white)
causing plants to become
bleached and break
Characteristics of Potato spindle tuber viroid
Hosts - potato, tomato, etc.
Control - cannot be controlled by chemical and biological means
Spread - through vectors or pollen
Found - leaves and tubers of potato plants
