organic control


 Viola Perennial Shrub Diseases:   Aster Yellows: Symptoms – Leaves are yellowed and narrow rather than oval. An abnormally high number of shoots form. Management – Remove infected plants. Control leafhoppers.   Bacterial Infection: Symptoms – An abnormally high number of shoots form Management – Remove infected plants. Black Root Rot: Symptoms – Plants are yellowed, stunted and die. Management – Try […]

Viola Perennial Shrub Diseases – Symptoms & Control


 Rudbeckia (black eyed susan) Perennial Shrub Diseases:   Aster Yellows: Symptoms – Leaf-like structures form where flower parts should be located. Plants may branch abnormally heavily (witches’ broom), leaves may be yellow and plants may be stunted. Management – Remove and destroy infected plants. Control leafhoppers early in the season with insecticides in order […]

Rudbeckia (Black Eyed Susan) Perennial Shrub Diseases – Symptoms & ...


Daylily Perennial Shrub Diseases:   Colletotrichum Leaf Spot or Leaf Scorch: Symptoms – Leaf tissue dies in a streak along the mid-vein. Management – Remove infected leaves. Destroy leaf debris at the end of the season. Avoid overhead irrigation.   Leaf Streak or Red Leaf Streak: Symptoms –  Reddish fleck form on the leaves as […]

Daylily Perennial Shrub Diseases – Symptoms & Control



 Blanket Flower Perennial Shrub Diseases:   Aster Yellows: Symptoms – Leaves are yellowed and flowers do not appear normal or of good quality. Management –  Remove and destroy infected plants. Control leafhoppers early in the season with insecticides in order to suppress spread of the pathogen   Bacterial Leaf Spot: Symptoms –  Areas between veins […]

Blanket Flower Perennial Shrub Diseases – Symptoms & Control


 Coreopsis Perennial Shrub Diseases: Aster Yellows: Symptoms – This virus is moved from infected clematis and some weeds by nematodes. Remove infected plants Management – Maintain good leafhopper control and eliminate nearby weeds that harbor aster yellows.   Bacterial Leaf Spot: Symptoms – Irregular brown blotches and spots develop on leaves Management – Water in a manner that […]

Coreopsis 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 […]

Coneflower Perennial Shrub Diseases – Symptoms & Control



Astilbe Perennial Shrub Diseases:   Flower Failure: Symptoms – Plants do not flower but otherwise appear healthy. Management – Divide and replant to alleviate overcrowding. Foliar Nematode: Symptoms – Brown areas on the leaf are restricted in shape by leaf veins. These angular spots are usually seen on the lower leaves. Management – Remove the leaves […]

Astilbe Perennial Shrub Diseases – Symptoms & Control


Crabapple Diseases Botryosphaeria Canker   Symptoms Leaves on infected branches wilt and die. Branches die back and become covered with dark-brown to black, pimple-like fungal fruiting structures. Wood under the bark is dark brown.   Management Trees most susceptible are those under drought stress. Be sure to water the plant […]

Crabapple Diseases