Connecticut State The Connecticut Agricultural Experiment Station

Herbaceous Ornamental Diseases

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Herbaceous Ornamental Disease Image Gallery

This gallery contains images of common plant disease problems which occur in Connecticut. Clicking the link below an image will open a fact sheet which explains the disease and options for management.

   Rhizoctonia blight pm ajuga with crown rot   Souther blight of ajuga with root rot

             Ajuga Rhizoctonia Blight                  Ajuga Southern Blight         

Foliar nematode disease of anemone with angular yellow and brown spots on leaves    Botrytis blight of angelonia with crown rot and gray mold on stems

Anemone Foliar Nematode                   Angelonia Botrytis Blight

aster rust showing yellow spots and orange sporulation on leaves    Botrytis blight of begonia with brown lesions on an old leaf

         Aster Rust                                      Begonia Botrytis Blight  

Impatiens necrotic spot virus on a begonia plant with mottling of leavs    powdery mildew of begonia with white mildew on leaves and flowers

            Begonia INSV                                           Begonia Powdery Mildew  
Botrytis blight of calibrachoa with brown old leaves   Black root rot of calibrachoa with wilting of leaves
   Calibrachoa Botrytis Blight                      Calibrachoa Black Root Rot

  bacterial leaf spot of catchfly with brown lesions on the upper leaf surface      Bacterial leaf spot of catchfly with water soaking and brown spots on the lower leaf surface

Catchfly Bacterial Leaf Spot

Impatiens necrotic spot virus on cineraria with mottling and necrosis on leaves          Downy mildew of coleus with angular yellow and brown patches on leaves

  Cineraria INSV                            Coleus Downy Mildew
 
  Black root rot of columbine with yellowing of leaves and stunted growth                Tobacco spotted wilt viurs on chrysanthermum with brown lesions on leaves and stems
        Columbine Black Root Rot                       Chrysanthemum TSWV

      Brown fust of chrysanthermum with small yellow spots and brown pustules     Powdery mildew of coreopsis with white mildew on the upper leaf surface

               Chrysanthemum Brown Rust                  Coreopsis Powdery Mildew          

  inpatiens necrotic spot virus on cyclamen leaves with ring spots   poty virus or dehlia leaves with mosaic sympotms

Cyclamen INSV                                  Dalia Potyvirus

bacterial leaf spot of daisy with brown spots on leaves      Botrytis blight on dianthus

                     Daisy Bacterial Leaf Spot                    Dianthus Botrytis Blight                          

Bacterial leaf spot of fern with brown necrotic lesions on leaves    Foliar nematode disease of fern with brown necrotic lesions on leaves

Fern Bacterial Leaf Spot                    Fern Foliar Nematode       

    edema on a gernium leaf with water soaking and brown spots     rust disease on ornamental grass stem with brown spots and pustules

  Geranium Edema                                     Grass Rust

  Phytophthora root rot of hellebore    southern blight on a hellebore stem with white and light brown fungal structures called sclerotia

 Hellebore Phytophthora Root Rot               Hellebore Southern Blight      

   Bacterial leaf spot on heuchera transplants   Botrytis blight of heuchera with large brown spots on a leaf

                              Heuchera Bacterial Leaf Spot                   Heuchera Botrytis Blight                                         

        rust disease of hollyhock with yellow and brown spots on leaves     Anthracnose of hosta with small brown spots on leaves       

                                                   Hollyhock Rust                         Hosta Anthracnose                                                                       

   southern blight of hosta with crown rot and light brown sclerotia    hosta x virus on a hosta plant with mottling of leaves      

                 Hosta Southern Blight                  Hosta X Virus                                             

impatiens downy mildew with light white mold on the lower surface of a leaf            tobacco spotted wilt virus on iris with brown necrosis along the leaves

             Impatiens Downy Mildew                     Iris Tomato Spotted Wilt Virus 

fungal leaf spot of iris     Downy mildew of lamium with angular brown lesions on leaves

Iris Fungal Leaf Spot                              Lamium Downy Mildew

Bacterial leaf spot of lavender       Balck root rot of lavender

     Lavender Bacterial Leaf Spot                  Lavender Black Root Rot              

Phytophthora root rot of lavender Rhizoctonia web blight of liatris

Lavender Phytophthora Root Rot                   Liatris Rhizoctonia Web Blight

Botrytis blight of lily with brown spots on leaves and flowers       impatiens necrostic spot virus and tobacco spotted wilt virus co-infection on lobelia

          Lily Botrytis Blight                                  Lobelia - INSV and TSWV
                     
  edema on a young shoots of peony      black root rot of phlox  
               Peony Edema                                        Phlox Black Root Rot                    

Powdery mildew of phlox with white mildew on leaves     Botrytis blight on poinsettia with gray mold on the stems    

               Phlox Powdery mildew                       Poinsettia Botrytis Blight                           

Black root rot of salvia with stunted growth    Bacterial leaf spot of salvia  

  Salvia Black Root Rot                             Salvia Bacterial Leaf Spot

Botrytis blight of sedum with gray mold on dead leaves and stems          Botrytis blight on tulip leaves and flowers
  Sedum Botrytis Blight                            Tulip Botrytis Blight

edema on a viola leaf    Botrytis blight of zinnia with brown spot on leaves and flower buds

    Edema on Viola                                                   Zinnia Botrytis Blight    

Bacterial leaf spot of zinnia with water soaking spots on leaves and flowers  Cercospora leaf spot of zinnia

Zinnia Bacterial Leaf Spot                         Zinnia Cercospora Leaf Spot

Alternaria leaf spot on zinnia leaves

Zinnia Alternaria Leaf Spot