Glossary of PSS 10: Diseases
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- What is the definition of disease in plants?
- -any kind of inuriuos abnormality
- What are the two categories of disease in plants?
- -physiological (environment)
-other living organisms (pathogens)
- What is a pathogen?
- -biological agent that causes the injury
-insecets, bacteria, fungi, viruses, nematodes, etc.
- What is the defintion of parasite?
- -an organism that derives nourishment from another living organism
- What is a host?
- -an organism that provides nourishment to another
- What is an obligate host?
- -organism that can only survive on the living host
- What is a host range?
- -list of several different plants that some parasites can feed off of
- What is the definition of bacteria used in this course?
- -one celled organism that enters through wounds and causes rot
- What is the definition of fungi in this class?
- -multi celled organisms that are either sprophytes or parasites such as molds and mildews
-causes decay of plants
- How do you perform bacterial disease control?
- -start with clean pots, media, and tools
-start with clean seed or healthy transplants
-use drip irrigation or water in morning to evaporate by evening
- How do antibiotics work for trees?
- -must be injected
-only temporary effects
-no topical sprays yet that work
- How do you perform fungal disease control?
- -start with clean pots, media, tools, seeds, or healthy transplants
-use drip irrigation or water in morning for evaporation by evening
-fungicides can be used as liquid drech, spray, or powder
- What are two synthetic fingicides?
- What is the definition of virus for this class?
- -infectious particles made up of nucleic acids with a protein coat
-no control methods
- What are nematodes in this class?
- -unsegmented worms that feed on roots and create wounds for bacteria and fungi to enter
- How does actual damage occur to plants?
- -direct feeding
-secretion of toxic substances
-secondary organism enters wound
- What is the most common symptom of plant damage/disease?
- What else can you look for in a plant that may be damaged/diseased?
-evidence of organism (web, tunnels, wax, etc)
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