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FUNGICIDE DAMAGE



Spray deposits on tablegrapes reduce market value
Spray deposits on tablegrapes reduce market value
Photo credit: Peter Magarey
Look For Look For Notes

   LOOK FOR


    Look for in bunches
  • Burnt foliage and berries with brown to black scars
  • Spots, ring spots or russet marks where berries touch, where spray liquid has collected or where the waxy layer on berries has been removed
  • Obvious spray deposits on berries

   CONDITIONS

  • Usually caused by toxic reactions to spray chemicals.
  • Fungicides can damage berries or burn shoots and leaves. Review spray records from the vineyard and adjacent crops to help in diagnosing spray damage. Unsightly spray deposits on bunches reduce market value of tablegrapes.

   NOTES

    Not all fungicides are compatible as mixtures, e.g. some EC formulations cause severe damage when mixed with other products.

OTHER FUNGICIDE DAMAGE IMAGES

Sulphur may burn berries and shoots if temperatures exceed 34°C within 6 hours of spraying at high humididty Sulphur burn on hot days is less likely if relative humidity is low and the canopy dries very quickly Visible spray deposits on leaves don't affect growth. They help indicate spray efficiency Some fungicides burn soft young foliage leaving small brown or black spots Some fungicides burn soft young foliage leaving small brown or black spots Black, crusty burn marks on berries can be caused by some fungicides or wrong chemical mixtures of otherwise safe chemicals Ring marks on berries where a fungicide emulsion mixture (EC) was sprayed to run-off

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