Perennial Shrub Diseases


Scheduling Disease Control in Woody Ornamental’s The scheduling of effective disease management measures is not a simple task nor can it be consistent. The activities of the organisms that cause plant disease are not governed by the clock. Their activity is influenced by temperature, relative humidity, soil moisture and other […]

Scheduling Disease Control in Woody Ornamental’s


The bacterium Pseudomonas syringae, is an opportunistic pathogen that can attack a wide variety of woody plants especially when they are damaged by frost or injured in some way. While there are a number of strains of this organism, syringae is most important on woody plants.  Symptoms Common, Persain, Chinese, and Japanese […]

Pseudomonas Syringae: A Common Pathogen on Woody Plants


Poplar Tree Disease Shoot Blight
Poplar Tree Diseases   Cryptodiaporthe Canker   Symptoms At first, a few twigs are killed. The fungus spreads rapidly to cause many variously shaped cankers and kill large branches as it does so. Perennial Canker formation leads to leaf yellowing, premature defoliation, and water sprout formation. Green-Brown material filled with […]

Poplar Tree Diseases



Black Spot Shurb Disease on Rose BUsh
Rose Black Spot Disease   A common disease of Roses, called Black Spot Disease , is caused by the fungus Diplocarpon rosae. This fungus attacks young expanding leaves. Fungal spored which were formed on infected fallen leaves or on canse are splashed to the new lower leaves of roses in […]

Black Spot Disease on Roses


 Perennial Diseases   Yarrow:  Diseases of Yarrow-Botrytis on yarrow flowers are often seriously inflicted with the disease Botrytis. Botrytis known as gray mold appears as brown dead areas and under proper moisture   may have a gray fuzzy appearance. It attacks buds, flowers, leaves, and stems. It may eventually kill […]

More Perennials and Perennial Diseases!


 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


Clematis Perennial Shrub Diseases Leaf Spot: Symptoms – Large spots form on the leaves, become tan or black in color and may have a zonate pattern within them. Management – Ensure good air circulation around clematis stems. Remove infected leaves as they are detected. Irrigate plants in a manner that keeps water off the […]

Clematis Perennial Shrub Diseases – Symptoms & Control



Perennial Shrub Diseases   Time and Time again it seems that we, as homeowners, are always fighting a never ending battle when it comes to disease and fungus on our Perennial Shrubs.  Shrub diseases can have a major impact on the entire landscape and if not properly treated can lead […]

Perennial Shrub Diseases


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