Home > Preview
The flashcards below were created by user
on FreezingBlue Flashcards.
What percentage of crop yield is lost due to disease?
How much does this cost?
+/+ benefited but not necessary
No direct effect on either organism
-/O one inhibits the other
+/- predator eats whole organism(large scale)
+/- Parasite feeds from organism (small scale)
Define a Parasite vs. a Pathogen
- Parasite- Derives nutrients from host, may or may not cause harm
- Pathogen- Agent that causes disease
- a physiological malfunction
- a continuous state
- many causes
- shows symptoms
define disease vs. damage
- damage- short term, mechanical(insect feeding, wind, hail)
- disease- long-term, disturbance of plant metabollism, caused by parasites or suboptimal conditions
biotic pathogens including organisms and bioligical molecules
abiotic or genetic nutrient deficiency, toxicity, genetic abborations
what are the 3 components of the disease triangle
- susceptible host
- condusive environment
- requires a living host to grow and reproduce
- do not compte in environment
- obligate parasites
- most cannot be grown in pure culture
- primarily on living hosts
- also capable of living in dead host or organic matter
- 2 stage life cycle
primarily on dead organic matter, also able to colonize
- grow and reproduce in soil
- good competator
- survive in soil
- poor competators
What is the Anna Karenina Principle?
Many factors must be in place for a system to work, if one factor is missing the system wont work
what percentage of plant problems are abiotic?
define diagnosis vs. proof
- diagnosis- based on associations, and confidence levels vary
- proof- when koch's postulates are met
What would you like to do?
Home > Flashcards > Print Preview