You nurture your tomato plants until you have beautiful fruit maturing on the vine.Upon closer inspection, you discover that somet
20.06.2023 - 07:31 / gardenerspath.com / Helga George
How to Identify and Treat Anthracnose on Hydrangeas Colletotrichum gloeosporioidesHydrangeas can be lush, carefree plants, but they are also vulnerable to a number of different fungal infections that can sully the leaves – and in some cases, the flowers.
You know that old saying, “There’s a fungus among us?” There is some truth to that.
A fungus called anthracnose can infect a large number of tropical and temperate plants, and it is widespread throughout the world.
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Unfortunately, hydrangeas can be one of its victims, and bigleaf hydrangeas – Hydrangea macrophylla – are particularly susceptible.
In this article, we’re going to help you to prevent, diagnose, and treat anthracnose in your hydrangeas.
I’ll cover the following topics:
SymptomsThe first indication that your hydrangea is infected with Colletotrichum gloeosporioides will be brown spots on the leaves. Unlike those caused by other pathogens such as Botrytis (aka gray mold), these spots will be circular or slightly irregular. The center of each spot will later turn tan.
If the spots border a leaf vein, they can develop an angular shape. If conditions are favorable, whole leaves and flower petals can develop large, irregular, dark brown spots that look like blotches.
In addition, the stems can develop sunken areas with raised margins known as cankers. These can be serious, since they can encircle or girdle the branches and stems and eventually kill them.
New growth may be crooked or deformed, making the branches look gnarled. A severe infection that has spread throughout the plant and caused deformed stems can kill the hydrangea.
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