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Herbicide Dmage

FAST FACTS - HERBICIDE DAMAGE
by Nanette Londeree, Master Rosarian

SYMPTOMS

  • Cupped leaves, twisting or bending of leaf petiole
  • Distorted and stunted fan-shaped leaves
  • Strange looking, thickened growth, often dark red or purple in color
  • Prominent leaf veins, reduction of leaf interveinal areas
  • Delayed leafing in spring
  • Chlorosis
  • Plant death

    CAUSE

  • Exposure to postemergent herbicides like Roundup (glyphosate)

    OPTIMAL CONDITIONS

  • May appear any time after exposure
  • Often seen in spring after plants have been exposed in fall or winter, during dormancy
  • Dry weather (must remain dry for 24 hours after exposure to the herbicide); any amount of wind that results in spray drift

    TREATMENT

    Prevention:

  • Donít use this type of herbicide in the garden
  • Protect plants from spray drift from adjacent properties if possible

    Elimination:

  • Cut out damaged portions of plants if not too extensive
  • Improve vigor of plant with good cultural practices especially sufficient water
  • Remove badly damaged plants; they are not likely to recover

    GOOD GUY / BAD GUY?

  • A very bad guy Ė it can destroy roses and any other plant it contacts

  • Photo of Herbicide Damage is by Baldo Villegas from the extraordinary webpage: http://members.tripod.com/buggyrose/iabioticdisorders.htm


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    Last Modified: 08/06/2013