Unusually cool nighttime temperatures exacerbate Pythium diseases in Louisiana vegetables
Following recent heavy downpours, Louisiana has been experiencing cooler-than-usual nighttime temperatures — conditions that are highly conducive to Pythium diseases, which are harmful to vegetable crops.
Raj Singh, LSU Ag-Center plant doctor and horticulture pathology extension specialist, said growers across the state have reported disease problems with their vegetables, especially those in low-lying areas of fields.
Pythium species thrive in wet soils and low temperatures, Singh said. Commonly known as water molds, Pythium species are soil-inhabiting, fungal-like microorganisms that are known to cause damping-off, root rot and cottony leak on a wide variety of vegetables as well as annual ornamental plants.
The diseases also may occur when seeds are planted too early in spring, are planted too deep or when old seeds are used, Singh said.