1. Plant Disease
  2. Host and Disease Descriptions

Snapdragon (Antirrhinum majus)-Botrytis Blight

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Spent flowers get water soaked spots and eventually develop the gray sporulation of Botrytis.

Jay W. Pscheidt, 2020.

PNW Plant Disease Image

Shoot blight due to Botrytis.

OSU Plant Clinic Collection, 2016.

Image related to Snapdragon (Antirrhinum majus)-Botrytis Blight

Stem and leaf blight of 'Montego Yellow' snapdragon due to Botrytis sp.

OSU Plant Clinic Collection, 2011.

See:

Greenhouse Plants, Ornamental - Gray Mold

Chemical control Best used with cultural controls. Tank-mix and/or alternate products with different modes of action to prevent the buildup of resistant fungi. Limit the use of any one group during the growing season.

  • Astun at 10 to 17 fl oz/100 gal water. Group 7 fungicide. 12-hr reentry.
  • Broadform at 4 to 8 fl oz/100 gal water. Group 7 + 11 fungicide. 12-hr reentry.
  • Chipco 26019 FLO at 1 to 2.5 quarts/100 gal water. Group 2 fungicide. 12-hr reentry.
  • Decree 50 WDG at 0.75 to 1.5 lb/100 gal water. Group 17 fungicide. 12-hr reentry.
  • Emblem at 2 to 4 fl oz/100 gal water. Use with oils or adjuvants may cause plant damage. Group 12 fungicide. 12-hr reentry.
  • Mancozeb-based products can be used as mixing partners and provide some protection. Group M3 fungicides. 24-hr reentry.
    • Fore 80 WP at 1.5 lb/100 gal water plus a spreader-sticker.
    • Protect DF at 1 to 2 lb/100 gal water plus 2 to 4 oz spreader-sticker.
  • Medallion WDG at 2 to 4 oz/100 gal water. Use with oils or adjuvants may cause plant damage. Group 12 fungicide. 12-hr reentry.
  • Mural at 4 to 7 oz/100 gal water. Group 7 + 11 fungicide. 12-hr reentry.
  • Orkestra at 8 fl oz/100 gal water. Group 7 + 11 fungicide. 12-hr reentry.
  • Pageant at 12 to 18 oz/100 gal water. Do not use with organosilicone-based adjuvants. Group 7 + 11 fungicide. 12-hr reentry.
  • Palladium at 4 to 6 oz/100 gal water. Avoid excessive runoff to small plants, which may result in stunting and/or chlorosis. Group 9 + 12 fungicide. 12-hr reentry.
  • Phyton 27 at 1.3 to 2 oz/10 gal water. Group M1 fungicide. 48-hr reentry.
  • Spirato GHN at 2 to 4 fl oz/100 gal water. Use with oils or adjuvants may cause plant damage. Group 12 fungicide. 12-hr reentry.
  • Terraguard SC at 4 to 8 fl oz/100 gal water. Group 3 fungicide. 12-hr reentry.

Reference Bolton, A.T. 1976. Fungicide resistance in Botrytis cinerea, the result of selective pressure on resistant strains already present in nature. Canadian Journal of Plant Science 56:861-864.