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US (MA): Botrytis detected on geranium leaves submitted to UMass lab

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.

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