1. Introduciton Flashcards
Which kingdom has the largest number of plant pathogen species?
- Fungi 8000
- Nematodes 500
- Viruses 300
- Bacteria 175
Define Potential yield.
Yield farmer can obtain following recommended practices
Define Yield loss.
Potential yield - actual yield
Define Pathogen.
An agent, usually a microorganism, that can incite disease.
Define Parasite.
An organism living on or in another living organism, its host, and obtaining its food from the latter.
Define Inoculum.
The pathogen or its parts that can cause infection.
fungal spore, bacteria,l cell, virus particle, nematode larvae, etc.
Define Infection.
Establishment of a parasite or pathogen within a host plant.
Define Infestation.
Contaminated or applied but not infected.
insect infestation
Define Pathogenicity.
The capability of a pathogen to cause disease.
Define Virulence.
The degree of pathogenicity of a given pathogen.
Define Saprophyte.
An organism that uses dead organic material for food.
Trichoderma harzianum
Define Obligate parasite or Biotroph.
A parasite that in nature can grow and multiply only on or in a living organism.
(virus, downy mildews–> fungi, rusts, powdery mildew=PM)
Define Facultative parasite.
Having the ability to be a parasite.
Pythium sp.
What is the difference between a biotroph and a hemibiotroph?
A hemibiotroph organism can live on tissue for some time and then continue to live on dead tissue.
Define Necrotroph.
Organism that kills tissue of host and then feed on it.
