Tomato (Solanum lycopersicum)-Gray Mold (Ghost Spot)

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Cause Botrytis cinerea, a fungus. Symptoms of ghost spot on fruit result from the fungus' unsuccessful attempt to infect. There is no rot, but fruit is unmarketable. The fungus can also colonize leaves and stems. The disease is promoted by wet, humid conditions.

Symptoms Faint, pale halos (3 to 8 mm in diameter) appear on fruit. They are white on immature fruit, yellow on ripe fruit. A small necrotic fleck may appear along with the halo. Spots rarely develop further.

Cultural control

  • Stake plants and manage excessive foliage to encourage air flow and rapid drying.
  • Remove dead or infected plant parts such as flowers, leaves, and rotted fruit.
  • Avoid overhead irrigation that keeps fruit wet a long time.

Chemical control

  • Bonide Fung-onil is available for home gardens. H
  • Carboxamide (Group 7) formulations are registered for use. Do not make more than two (2) sequential applications before alternating to a labeled fungicide with a different mode of action.
    • Endura at 9 to 12.5 oz/A on 7- to 14-day intervals. Preharvest interval is 0 days. 12-hr reentry.
    • Fontelis at 10 to 24 fl oz/A on 7- to 14-day intervals. Preharvest interval is 0 days. 12-hr reentry.
  • Copper (Group M1) products are not recommended as stand-alone materials.
    • Champ WG at 1.06 lb/A on 3- to 10-day intervals. 48-hr reentry. O
    • Cueva at 0.5 to 2 gal/100 gal water on 7- to 10-day intervals. May be applied on the day of harvest. 4-hr reentry. O
    • Cuprofix Ultra 40 Disperss at 1.25 to 3 lb/A on 5- to 10-day intervals. 48-hr reentry.
    • Kocide 2000 at 1.5 to 3 lb/A or Kocide 3000 at 0.75 to 1.75 lb/A on 5- to 10-day intervals. 48-hr reentry. O
    • Previsto at 1 to 2 quarts/A on 5- to 10-day intervals. 48-hr reentry. O
  • Inspire Super (Group 3 + 9) at 16 to 20 fl oz/A on 7- to 10-day intervals. Do not make more than one (1) application before alternating to a labeled fungicide with a different mode of action (non-Group 3 or 9). Preharvest interval is 0 day. 12-hr reentry.
  • LifeGard WG (Group P6) at 1 to 4.5 oz/A on 7- to 14-day intervals for activating plant resistance. Refer to label for appropriate rate per application volume. Preharvest interval is 0 days. 4-hr reentry. O
  • Miravis Prime (Group 7 + 12) at 9.2 to 11.4 fl oz/A on 7- to 21- day intervals. Do not apply more than two (2) sequential applications. Preharvest interval is 0 days. 12-hr reentry.
  • Orondis Opti (Group M5 + 49) at 1.75 to 2.5 pints/A on 7- to 14-day intervals. Do not apply more than two (2) sequential applications. Preharvest interval is 0 days. 12-hr reentry.
  • OSO 5% SC (Group 19) at 3.75 to 13 fl oz/A on 7- to 14-day intervals. Can be applied the day of harvest. 4-hr reentry. O
  • Problad Verde at 20.5 to 45.7 fl oz/A on 7- to 10-day intervals. Do not make more than two (2) sequential applications before rotating to a labeled fungicide with a different mode of action. Preharvest interval is 1 day. Reentry interval is 4 hours. O
  • Regalia (Group P5) at 1 to 4 quarts/A plus another fungicide on 7- to 10-day intervals. Does not benefit from the addition of an adjuvant. Preharvest interval is 0 days. 4-hr reentry. O
  • Scala SC at 7 fl oz/A on 7- to 14-day intervals. Use only in a tank-mix with another fungicide effective on this disease. Do not apply within 1 day of harvest. 12-hr reentry.
  • Trilogy at 0.5% to 1%. Not labeled for use in Oregon. Do not use above 90°F or when plants are under heat or moisture stress. Do not use when foliage is wet as good coverage is essential. Poor control as a stand-alone product. 4-hr reentry. O

Biological control

  • Actinovate AG at 3 to 12 oz/A as a foliar spray on 7- to 14-day intervals. 1-hr reentry. O
  • Actinovate Lawn & Garden at 1/2 to 1 teaspoon/gal water. H O
  • Double Nickel LC at 0.5 to 4.5 pints/A on 3- to 10-day intervals. Can be applied the day of harvest. 4-hr reentry. O
  • Romeo at 0.45 to 0.68 lb/A on 7- to 10-day intervals starting prior to infection. Preharvest interval is 0 days. 4-hr reentry. O
  • Serenade Opti at 14 to 20 oz/A on 7- to 10-day intervals. Applications can be made up to and the day of harvest. 4-hr reentry. O
  • Stargus at 2 to 4 quarts/A plus a nonionic surfactant on 7- to 10-day intervals. Preharvest interval is 0 days. 4-hr reentry. O