Environment
As the disease is soilborne, it is not uncommon to find clusters of diseased plants together. The pathogen proliferates in stem tissues when soil has high moisture content and air temperatures from 70-80 degrees Fahrenheit. Rainy seasons promote brown stem rot. When soil is untilled, the disease is more likely to persist in soil. The incidence of brown stem rot is highest at soil pH ~6.3.
Read more about this topic: Phialophora Gregata
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