nov 9 - the american chestnut tree is surviving in...

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the american chestnut tree is surviving in Appalachia only as small trees as a result of the chestnut blight epidemic the people of Appalachia became better off chestnut trees are now found only in cities people can no longer buy roasted chestnuts from sweet vendors the Plant Quarantine Act was passed all of the above answer: the plant Quarantine Act was passed elm bark beetles become contaminated with the spores of the Dutch elm disease pathogen because sticky spores produced in beetle galleries adhere to emerging adult beetles beetles feed on flowers of infected elm trees early int he spring rain splashed conidia adhere to adult beetles beetle larvae feed on fungal spores (true but doesn't transmit disease) all of the above answer: sticky spores produced (answer a) viruses as plant pathogens obligate parasite (won't sit on a counter top or petri dish) replication (also, all plant pathogen nematodes are obligate parasites) spread by insects very small characteristics of a virus viruses are small cannot be seen using a light microscope measured in nanometers (10^-9 meters) viruses are simple composed of nucleic acid and protein not cellular (sub-cellular)
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This note was uploaded on 11/15/2010 for the course PLPA 200 taught by Professor Darcy during the Spring '08 term at University of Illinois, Urbana Champaign.

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nov 9 - the american chestnut tree is surviving in...

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