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Hydrangea Shrub Diseases


Botrytis Blight

  • Symptoms

    • Petals turn brown and fall. Leaf spots form, especially where faded petals have fallen. Flower buds are killed before opening.
  • Management

    • Space plants to insure good air circulation. Maintain low humidity. Avoid watering late in the day. Remove crop debris. Apply chlorothalonil, iprodione, mancozeb, or vinclozolin. Apply ZeroTol Fungicide as the buds swell in the Spring and repeat application until symptoms get better. ZeroTol Fungicide is a ready to use spray that is made with all natural ingredients, which means it's safe for children and pets. Very effective on Botrytis Blight! 

 


Cercospora Leaf Spot

  • Symptoms

    • Tan spots with reddish-brown halos develop on leaves.
  • Management

 

Cercospora Leaf Spot on Hydrangea


Powdery Mildew

  • Symptoms

    • Yellow areas form on leaves. These may become purplish. White, cottony fungal growth forms on the lower surface of the leaf.
  • Management

    • ZeroTol Fungicide is a very effective way to control any type of mildew on ornamental shrubs. It is an ALL natural product that is safe for the environment! 

 

Powdery Mildew


Virescence

  • Symptoms

    • Flowers are green and may be stunted. Leafy shoots grow from the flower parts. Plants decline and die.
  • Management

    • Remove ANY infected plants. Maintain good insect control.
Virescence affecting Hydrangea


Viruses

  • Symptoms

    • Leaves may be mottled, have yellow spotting, dead flecks, line or ring-spot patterns. Plants may be distorted or have flower color breaking, or few flowers.
  • Management

    • Plant virus-indexed cuttings. Maintain good insect and mite control. Remove infected plants. Apply ZeroTol Fungicide/Bactericide as a preventative measure. ZeroTol is an organic ready to use spray that would eliminate all headaches before they start! 





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