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What causes Late blight in Solanum?
What are the ideal growth conditions for Phytophthora infestans?
temps in the 60-80F
How does Phytophthora infestans overwinter/survive?
As mycelium in infected potato tubers in storage or in the soil (become volunteers)
Survive in culls
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
How to manage late blight?
Elimination of overwintering inoculum
Planting pathogen free tubers
Protectant fungicides most useful if applied before sporulation
systemic fungicides can be applied shortly after an infection has begun
Phytophthora infestans sexual stage
antheridium + oogonium = oospore which then gives rise to a sporangium
plant path lab 10