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Holly Shrub Diseases


Leaf Scorch

  • Symptoms

    • Circular to irregular, tan spots appear in early Spring or Summer. Tiny, black fungal fruiting structures pepper the spot surface as a result of attack by the secondary fungus.
  • Management

    • No control is recommended

 

Holly Leaf Scorch


Nematodes

  • Symptoms

    • Yellowing, stunting, and twig dieback occur. The root system is small and has dead areas, as well as galls in some cases.
  • Management

    • An analysis of soil and roots must be done to confirm that nematodes are actually causing the symptoms. Care for plants well so that they are not under stress if at all possible. If the shrub is replaced, first fumigate and thoroughly aerate the soil. AzaGuard is an easy to use Insecticide that is very effective when trying to control Nematodes!

 


Phytophthora Root Rot

  • Symptoms

    • Leaves yellow and brown spots develop. Branches, and eventually the entire plant, dies.
  • Management

    • Remove the infected plant. Do not replace it with a woody ornamental unless the planting site is first fumigated and aerated thoroughly. Protect surrounding plants with mefenoxam or etridiazole.

 

Holly Dieback due to Phytophthora Root Rot in a Root Cell


Spine Spot

  • Symptoms

    • Pinhead-sized or larger spots frequently surrounded by a purple halo appear on leaves in late Winter and early Spring.
  • Management

    • Use AllGuard in the Spring to help prevent future Spine Spot. BUY NOW

 


Tar Spot

  • Symptoms

    • Small, yellow spots form on leaves and turn reddish brown with a small, yellow halo later in the summer. In the autumn, a flat black, cushion-shaped fungal structure forms beneath the leaf surface.
  • Management

    • Use AllGuard in the Spring to help prevent future Tar Spot. BUY NOW
Holly Tar Spot


Thielaviopsis Root Rot

  • Symptoms

    • Plants are stunted and have branch dieback. Roots are blackened.
  • Management

    • Inspect the roots of containerized hollies before planting. Do not use those with blackened roots. Apply thiophanate methyl, triflumizole, or thiophanate methyl + etridiazole as a soil drench to protect healthy roots.
Courtesy of U of I: Thielaviopsis Root Rot
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