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.
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!
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.
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
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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