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VEN 002 Final exam (113 questions and answers).
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VEN 002 Final exam (113 questions and answers).
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VEN 002 Final exam (113questions and answers)
disease - answer a dysfunction caused by both
biotic and abiotic agents
causal agents that are living organisms causing
disease in grapevine include: - answer fungi,
bacteria, viruses
conidium - answer
the history of viticulture has been greatly affected
by these epidemics: - answer Powdery Mildew,
Downy Mildew, Pierce's Disease
Fungi are: - answer 1. Heterotrophic
2. Multicellular
3. Eukaryotic
4. Small, frequently microscopic filamentous
organisms
Downy mildew is not a... - answer fungus
,Which pathogen is not a fungus? - answer Downy
mildew
Conidia - answer -asexual spores
-they are the reproductive units of powdery mildew
during the growing season
-they are responsible of spread of disease in the
vineyard
Bacterial Diseases - answer 1. Prokaryotic
2. Unicellular
3. Enter plants through wounds vectored by other
organisms or natural openings
Grape Bacterial Diseases - answer 1. Pierces
Disease (Xylella Fastidiosa)
2. Crown Gall (Agrobacterium Vitis)
3. Grape Yellows (phytoplasmas)
Disease Triangle - answer
Pathogen+Environment+ Host= Amount of Disease
1. For a plant disease to occur, a plant and
pathogen must come into contact and must
interact
, 2. Plant must be of a species or variety and at a
stage of development that is susceptible to the
pathogen
3. Pathogen must be capable of infecting the plant
Environment must favor the growth, virulence, and
dispersal of the pathogen and limit plant
resistance
inoculum - answer a substance used for
inoculation
virulence - answer the degree of pathogenicity
within a group or species of parasites as indicated
by case fatality rates and/or the ability of the
organism to invade the tissues of the host. Think
of its root "virus"
the full impact of a pathogenesis high be avoided
by: - answer 1. reducing the grapevine
susceptibility
2. reducing the inoculum
3. manage the plant environment
Management techniques for pathogenesis: -
answer 1. Regulatory
2. Resistant Cultivars
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