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How to Cure Amaryllis Red Blotch Blight

Amaryllis flowers grown in shady, moist spots are susceptible to red blotch, also known as leaf scorch. Red blotch is a disease caused by a fungal pathogen -- Stagonospora curtisii -- which is carried on the amaryllis bulb. Symptoms are hard to miss: The stems and foliage develop red spots that eventually spread. Flowers may wilt, while the stems may bend or break. Red blotch makes the amaryllis, a plant grown for its beauty, unattractive, and it's difficult to manage

Things You'll Need

  • Fungicide
  • Container
  • Candy thermometer
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    • 1

      Remove red blotch-infected amaryllis plants and destroy them.

    • 2

      Apply a fungicide containing Thiophanate-methyl to the plant in early fall, according to label instructions.

    • 3

      Try another method if the fungicide doesn't work. Dig up the amaryllis bulb and wipe the soil off of it. Soak it for 30 minutes in water at a temperature of 104 to 114 degrees F. Use a candy thermometer to keep track of the water's temperature.

    • 4

      Prevent red blotch by soaking new amaryllis bulbs, for 30 minutes, in a fungicide with thiophanate-methyl as the active ingredient. Plant the bulb immediately after soaking.