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Coneflower Perennial Shrub Diseases - Symptoms & Control


 Coneflower Perennial Shrub Diseases:


Alternaria Leaf Spot:

Symptoms - Small dark brown to black leaf spots become oblong and develop lighter-colored centers as they enlarge. Spots on young plants are often along the midrib.

Management - Water in a manner that keeps moisture off the leaves and stems. Apply PureSpray Green to help protect healthy plants and control existing leaf spot.

 

Aster Yellows:

Symptoms - Flowers remain green. Leaf-like structures form in place of some flower parts and tight clusters of such flowers may form. In the spring, foliage may be bright yellow.

Management - Remove infected plants. Remove weeds in the area and other aster-related plants that have similar symptoms.


Bacterial Leaf Spot:

Symptoms - Dark brown to black spots form on leaves and are angular in shape because they are limited by large leaf veins. The spots often have a yellow halo

Management - Water in a manner that keeps moisture off the leaves and stems. Apply PureSpray Green to help protect healthy plants

 

Botrytis Leaf Spot & Stem Rot:

Symptoms - Brown spotting on leaves is sometimes accompanied by a stem rot.

Management - Water in a manner that keeps moisture off the leaves and stems. Apply iprodione + thiophanate methyl or copper to protect healthy plants

 

Cercospora Leaf Spot:

Symptoms - Brown spots from on the leaves. Tiny black dots are seen within the spots.

Management - Water in a manner that keeps moisture off the leaves and stems. Apply iprodione + thiophanate methyl or copper to protect healthy plants or “Go Green” and use PureSpray Green to protect healthy plants from leaf spot!

 

Foliar Nematode:

Symptoms - Purplish, angular spots form between veins. The spots become tan with age.

Management - Most other perennials are also susceptible to foliar nematode. Examine all surrounding plants for similar symptoms. Remove infected plants. Water in a manner that keeps moisture off the leaves and stems.

 

Leaf Mottle:

Symptoms - Light and dark green blotches develop on leaves. Sometimes there dark green ring spots present or line patterns and etches formed by dead tissue.

Management - Remove infected plants

 

Sclerotinia & Sclerotium Crown Rot:

Symptoms -  Plants with dark spots on lower stems and dark roots wilt and die. White fungus with dark granule-like (Sclerotinia) or tan balls (Sclerotium) structures form on the surface of the dead areas.

Management - Remove infected plants


Septoria Leaf Spot:

Symptoms -  Purplish-brown spots develop on the leaves

Management -  Keep moisture off of the leaves and stems

 

White Smut:

Symptoms - Yellow spots form on the leaves and become

Management - Water in a manner that keeps leaf surfaces dry and water when the leaves will dry quickly.

 


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