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.