Common Diseases in Hosta Plants

The hosta is a stunning ornamental plant. Giving a lush touch to your garden is as easy as placing the hosta plant.

The disease is not often a problem for Hosta however, insects and leaf-eating pests could be a threat to Hosta’s health.

The first indications of visible damage must be taken as a signal to take action.

It is essential to address Hosta diseases immediately when they begin to occur, because the delay in addressing the issue could lead to the plant becoming a dying plant.

What I’m going to provide you with is information about common hosta ailments and the best ways to manage them.

I’ll also show you some actual photos of pests and diseases that the plant is believed to be a victim of.

How to prevent the ruin of your hostas by taking care of them.

It is easy to tell from the visible indicators that the first symptoms of disease are beginning to appear in your plants.

What are the most prevalent illnesses that can affect the hosta?

[1] Hosta Virus X (HVX)

In the late 20th century, American researcher Lockhart found Hosta Virus (HVX) in the late 20th century. (HVX).

The disease can be spread through the sap that is absorbed by gardening tools or on hands while cutting or dividing the shrubs.

If you are using an unwashed hoe or use your hands to contact green plants that are healthy, the virus gets into the plant’s tissues through wounds and cuts, and then begins to multiply and feed.

hosta variety


Prior to the detection of the virus small yellow spots, dots, flecks, and rings were thought to be strange hosta colors.

It was discovered that it was an illness that causes stunted growth as well as curly leaves.

Hosta Viral X (HVX) distinctive features:

  • The color variation of leaves is because of variations in density of tissue and coloration.
  • Dark stripes of green on veins of leaf prove hosta virus x infection.
  • Chlorosis is a common occurrence and, as a result the leaves turn an eerie hue of green. The vein may turn yellow at an advanced stage.
  • The tiny, fuzzy spots appear to be an image of a mosaic
  • The plant’s growth is slowed which resulted in a diminution of the plant’s size;
  • The color of the flowers is diminished, and there’s no ovary to be found.

Action immediately: If there is a sign of infestation the entire garden must be planted as far from the affected area as is possible. The affected plants should be cleared of in the form of household waste or burned to stop the Hosta virus spreading across other plant species.

Although Hosta sieboldiana is also called Siebold’s plantain lily and its hybrids are resistant to viruses, it does not mean they’re free of risk of getting ill.


It’s not worth trying in saving the plants if a disease was discovered since the disease is incurable.

It is a fungus that infects all parts of hosta, eventually ending its life. I suggest burning the diseased hosta, and disinfecting the equipment.

[2] Gray Rot

Gray Rot fungi are omnivores like their hosts. Herbaceous plants, flowers and berry and fruit plant species are affected.

As well as being prevalent The disease is also fatal to your beloved hosta.

The plant will go out of business if you don’t take the appropriate steps promptly.

Mycelium is produced by the botrytis fungus on the plant, and then releases spores which are carried by the winds to nearby plants.


Gray rot symptoms vary based on the stage at which the disease’s progression.

  • Botrytis spores can be seen at the beginning of the disease as blotchy dry, and deformed leaves with tips and edges.
  • The early stages of the disease begin with the degeneration of the leaves of the hosta.
  • Advanced stage: The decay has spread to all area of the leaf.
  • Initially, treatment involves spraying fungicides onto the affected leaves.
  • It is necessary to eliminate the plant affected if the infestation is serious.


The prevention of gray rot is simpler than treating it after it has happened.

In the spring in the spring, when the soil remains quite loose apply the soil treatment.

Spray contact fungicide based on copper on the planting areas using the sprayer.

[3] Phyllosticta Leaf Spot

Outdoor and indoor plants are equally susceptible to Phyllosticta Leaf Spot also known as brown spot disease.

Temperatures above the temperature of 77 degrees Fahrenheit (25degC) are perfect for the Phyllosticta fungal.


  • Brown spots of large size appear on the plant’s leaves.
  • The spots slowly blend to form a huge lesion.
  • The fungus is visible as a yellow or white spot on the surface of the spots.
  • The disease is often affecting both the leaves as well as the hostas flower stems
  • The plants that are infected slowly dry out and then die.
  • The brown spots are visible on the leaves. They are then smashed and fall off.
  • The stage that is advanced of Phyllosticta leaf spot can lead to the demise in the plants.


Limit the frequency as well as amount of watering the hosta by burning its leaves and stems that contain fungal spores.

It is recommended to throw away the entire plant when it has been severely damaged.

It is recommended to remove diseased hostas from their initial locations to avoid them spreading to other plants in the vicinity.

Copper-based fungicides work well in fighting the disease. Applying a spray every 10 days until the flowering starts is the best treatment for brown spot disease.

[4] Root, Stem and Collar Rot

It’s a fungal rot that is caused by phytophthora. It’s a fungus which lives in soils and infects plants through the rhizome and roots.

The fungi are inactive during cold weather, but become active when the climate gets warmer and humid.

The fungus causes rot at a lower rate than soft rot caused by bacteria. The odds favor you to keep the fragments.


It is almost impossible to detect root decay in the beginning without first identifying and examining the roots system. The roots are susceptible to rotting and cause some signs to show up above the the ground.

The leaves’ discoloration is a surefire method to identify root decay.

The leaves begin to turn yellow starting at the edges and moving to the center , and then they turn brown and dry before dropping off.


There isn’t anything as a cure for this condition in any way.

Don’t use soil that is underneath the plant. Also, don’t transplant infected plants or ones that are suspected to be infected.

To stop the fungus from spreading further, eliminate all hostas that are diseased from the gardens and then dispose them in a safe manner.

  • The treatment of the initial stages of the disease involves cutting your hosta up and removing all soft roots as well as any rhizome material which isn’t white and hard such as coconut meat.
  • After cleaning, apply hydrogen peroxide to clean it up a few times, then allow it to dry completely in the sunlight.
  • Utilize a systemic fungicide such as Liquid Copper Fungicide to treat the issue. Phyton is also an alternative.
  • Now, I’d remove the soil from that hole and then replace it.
  • In the event that it is severe enough to be controlled, get rid all the plant as well as the soil surrounding it to stop the spread of the disease.

Copper Sulfate And Bordeaux Liquid Spraying Are Effective

But placing the health of the plant at risk isn’t an ideal decision. When the first leaf begins to turn yellow, dig up the hosta and thoroughly examine it for signs of root decay.

Cut the affected areas using an abrasive knife. apply fungicides or crushed activated carbon.

Do not plant the hosta with disease until it has dried for about a couple of hours, then place it in a new container.

[5] Bacterial Soft Rot

Soft rot caused by bacteria can be caused by a wide range of bacteria. It usually occurs after a leaf is damaged.

The winter icing may also cause the same types of cuts. It typically occurs in the warm-up period following the frost.


The dying lower leaves and cuttings emit a distinctive stink that you will not be able to distinguish from something else.

There is visible signs of damage on the plants. This is the reason why the leaves of the hosta have been spotted with the new spots of brown.


Infested plants need to be removed and destroyed.

Be sure that all equipment that has come in contact with plants are properly cleaned. Wash the hands as well. Wash your gloves and fingers with care and thoroughly.

Because the bacteria is spread slowly and only affects the areas that are damaged The removal of the entire garden isn’t required in this case.

[6] Anthracnose

The disease can affect healthy leaves as well as the surrounding shoots rapidly, and is extremely common.

The most vulnerable species of plants are ones that require lots of shade and lots of water.


If a hosta is affected it will show small, brown spots that are round on the leaves , which will grow larger and feature darker borders, similar to the rust that covers the plant.

The spots actually “tear” the leaf, leaving only the veins intact.


Remove diseased leaves, reduce the humidity, as well as ensure that the plants are adequately ventilated (make sure there’s enough space to allow the circulation of air).

After that, apply an insecticide to prevent the remaining healthy leaves from getting infected once more.

[7] Crown rot (Southern Blight)

Petiole rot, also referred to by the name of crown rot is a serious fungal infection.

Petiole rot, also referred to by the name of crown rot is a serious fungal infection. The cause is a fungus known as fusarium that rots roots from the inside.

It’s not a huge issue until it enters the crown, and at that point you’ll need to remove it until you can get the clean tissue.

Fusarium is a more serious issue in soils for potting that is drying out too long between waterings, however it must usually get onto the soil or plant in some way to cause an problem.


The wilting and yellowing of leaves around the outline are the most prominent signs.

When you get to the base of the leaves, it turns soft, spongy and decaying.

Leaves that are too big to hold their own weight could “fall off” the main plant completely.

It is also possible to see the fungal filaments (mycelium) which are white.

As the fungus develops, it produces tiny sclerotia seedsthat eventually cover the entire plant.

If it’s cold outside, the fungus goes into hibernation, however, when the weather gets warmer and moister, it comes to life.


There is no cure for this condition. Do not use the soil that was previously used to replant.

To prevent spreading the disease, eliminate or destroy any hosts that are infected in the garden.

You should now be able to recognize the common Hosta ailments. Should you have concerns or suggestions you would like to share, do not hesitate to contact me.



Went from a bad gardener to a half-decent one over 10+ years. Super happy to share my tips and tricks with you :)