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18 Cards in this Set
- Front
- Back
What is the definition of disease in plants?
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-any kind of inuriuos abnormality
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What are the two categories of disease in plants?
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-physiological (environment)
-other living organisms (pathogens) |
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What is a pathogen?
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-biological agent that causes the injury
-insecets, bacteria, fungi, viruses, nematodes, etc. |
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What is the defintion of parasite?
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-an organism that derives nourishment from another living organism
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What is a host?
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-an organism that provides nourishment to another
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What is an obligate host?
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-organism that can only survive on the living host
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What is a host range?
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-list of several different plants that some parasites can feed off of
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What is the definition of bacteria used in this course?
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-one celled organism that enters through wounds and causes rot
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What is the definition of fungi in this class?
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-multi celled organisms that are either sprophytes or parasites such as molds and mildews
-causes decay of plants |
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How do you perform bacterial disease control?
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-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 |
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How do antibiotics work for trees?
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-must be injected
-very costly -only temporary effects -no topical sprays yet that work |
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How do you perform fungal disease control?
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-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 |
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What are two synthetic fingicides?
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-captan
-thiram |
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What is the definition of virus for this class?
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-infectious particles made up of nucleic acids with a protein coat
-obligate parasites -no control methods |
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What are nematodes in this class?
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-unsegmented worms that feed on roots and create wounds for bacteria and fungi to enter
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How does actual damage occur to plants?
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-direct feeding
-secretion of toxic substances -secondary organism enters wound |
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What is the most common symptom of plant damage/disease?
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-wilting
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What else can you look for in a plant that may be damaged/diseased?
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-organism
-evidence of organism (web, tunnels, wax, etc) |