Lab 10

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Author:
wsucoug12
ID:
310860
Filename:
Lab 10
Updated:
2015-11-03 14:48:54
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plant path
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plant path lab 10
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  1. What causes Late blight in Solanum?
    Phytophthora infestans
  2. What are the ideal growth conditions for Phytophthora infestans?
    • temps in the 60-80F
    • high moisture
  3. How does Phytophthora infestans overwinter/survive?
    • As mycelium in infected potato tubers in storage or in the soil (become volunteers)
    • Survive in culls
  4. Characteristics of Phytophthora infestans?
    • Kingdom stramenopila phylum oomycota
    • Heterothallic (two mating types)
    • Sporangiophores generate sporangia
    • sporangia (germinate indirectly to zoospore when it is less than 12C. germinate directly into germ tube above 12C)
    • Prefers lower temps and more moister this is when zoospores are made
  5. How to manage late blight?
    • Elimination of overwintering inoculum
    • crop rotation
    • Planting pathogen free tubers
    • resistant cultivars
    • Protectant fungicides most useful if applied before sporulation
    • systemic fungicides can be applied shortly after an infection has begun
  6. Phytophthora infestans sexual stage
    antheridium + oogonium = oospore which then gives rise to a sporangium

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