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Greenhouse Updates: April 18, 2023

Botrytis Blight
April 18, 2023

Botrytis blight was observed on geranium leaves submitted to the UMass Extension Plant Diagnostic Lab this week. Botrytis has a wide host range and can affect all plant parts. The leaf lesions caused by this fungus may begin as brown, water-soaked areas. Eventually, fuzzy gray spores can be seen with a hand lens or the naked eye. Greenhouse sanitation, good air circulation, and keeping the plant canopy dry are critical for Botrytis management.

For more information, see our fact sheet:

Geranium botrytis 1 (A. Madeiras) Geranium botrytis 2 (A. Madeiras)







- Angela Madeiras, Extension Educator and Diagnostician, UMass Extension Plant Diagnostic Lab