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9 Cards in this Set
- Front
- Back
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What are characteristics of soilborne pathogens?
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Above ground symptoms appear after "damage is done"
Condensed and radiating pattern of spread in field Inoculum doesn't travel far on its own Good facultative saprobes Form durable survival structures Management is difficult |
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What are the symptoms of Rhizoctonia solani?
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Damping off
Below ground-root rot, stem cankers Above ground-stem cankers, foliar blights (in turf) |
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What are the signs of Rhizoctonia solani?
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Mycelium/hyphae has a 90 degree branch, constriction, septa, is think and brown
No asexual spores Sclerotia-clusters Sexual stage not common (Basidiomycota) |
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What are the signs of Sclerotium rolfsii?
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Abundant white mycelium, "ropey"
Asexual stage without spores Sclerotia Sexual stage (Basidiomycota) |
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What are the signs of Fusarium oxysporum?
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Sporodochia, macroconidia, microconidia
Chlamydospores (resting stage) Sexual stage (Ascomycota) |
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What is damping off?
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death of a seedling before or shortly after emergence due to decomposition of the root and/or lower stem; it is common to distinguish between preemergence damping-off and postemergence damping-off
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What are signs of fungal-like plant pathogens?
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Coenocytic hyphae/mycelium
Zoospores/sporangia Sexual stage common-oospores, oogonia, antheridia |
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What are characteristics of Phytophthora spp?
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"plant destroyer"
Prefers cool, wet conditions Sporangia--germinate directly or produce zoospores Oospores in Chromista |
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What are symptoms of Pythium?
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Damping off
Seed rot, root rot, fruit rot, soft rot "Pythium blight" in turf Sign- white mycelium |
