Where Is Alternaria Mold Found? DIY Mold Cleaning Methods

Helen Skeates
Helen Skeates
23 min read

If you’re asking where Alternaria mold can be located, the traditional response is indoors, despite the fact that mold can grow both outside and indoors. It’s possible to view it indoors, too, thanks to a special mixture.

You’ll learn the difference between Alternaria mold’s outdoor and indoor growth as you read this post. In addition, you’ll learn about the potential harm it might do to humans’ health, as well as how to safely get rid of it.

What Is Alternaria Mold?

All across the world, Alternaria is a collection of more than 300 different mold species. They form long, chain-like structures, which eventually grow into thick colonies of black or green or gray. As they fly around, spores land in water or soil. At least 20% of agricultural spoilage is caused by Alternaria molds, which are common causes of decomposition. However, these molds are not all harmful. Invasive plant species have been kept under control by some biocontrol agents.

Alternaria species

Alternaria alternata (one of the most common species), A. tenuissima, A. infectoria, A. chartarum, A. stemphyloides, A. geophilia, and A. dianthicola are some of the 300 species in the Alternaria genus. Infections have been wiped out on every one of these animals. Other Alternaria species have yet to have their pathogenic agents identified.

Alternaria ecology

It is possible to find Alternaria species in a variety of habitats, where they absorb nutrients in two different methods. In soil, plants, and even on food, saprophytic organisms breakdown organic materials. Alterariosis is a disease caused by parasitic organisms infecting plants, animals, and humans.

To cultivate Alternaria molds, you need a temperature of 1–35°C (33–95°F) and pH levels of 2.5–10. A temperature of 20–25°C (68–77°F) is ideal for optimum plant growth. Alternaria molds can mature in as little as five days, making them extremely fast-growing. Alternaria, like all molds, thrives in moist, warm environments.

Alternaria Mold Characteristics, Risk Factors, and Removal Tips

Where Can I See An Alternaria Mold?

Indoors and outdoors, Alternaria mold can be found. In the following paragraphs, we will explain the difference between the two.

Outdoor development

For this reason, Alternaria mold is frequently referred to as “outside mold.” A majority of this type of Alternaria mold can be found in plants and the soil.

Most of the time, you’ll find them in rural areas or places with a mild climate.

The Alternaria mold is responsible for the plants’ grayish patches. It’s common for these to be confused for dirt or to be interpreted as the beginnings of withering.

Indoor development

Even though Alternaria molds are rarely found indoors, they are nonetheless possible. It occurs because of the presence of two components in a solution.

The first one is wind, and the other is the mold spores themselves. Mold spores mixed in the wind will surely spread mold.

Still, Alternaria alternata is a peculiar type since it develops even in materials like iron, bricks, tiles, wallpaper, plaster, canvas, and paper.

What Are the Health Effects?

As a result of its ability to thrive in many substrates, Alternaria alternata is one of the rarest fungi.

Alternaria mold can cause major health dangers regardless of where it grows, indoors or out.

Health hazards associated with Alternaria mold exposure are summarized here. Pay close attention to what you’re reading so you don’t catch any of these diseases.

  • Fatigue
  • Headache
  • Rashes on the skin
  • a sore throat
  • Itchy, red eyes
  • Cough
  • Snorting or sneezing

Remind anyone with respiratory issues, such as asthma, of the dangers of Alternaria mold, so that they can take precautions.

What are the symptoms of an Alternaria allergy?

In the spring and summer, this type of mold is a common trigger for those with allergies. There are a lot of allergic spores out there. Coughing, runny nose, sore throat, sneezing, throat irritation, headache, weariness, dizziness, red, itchy, watery eyes, and rashes/itchiness of the skin are all symptoms of sensitivity to Alternaria spp.

How do you detect Alternaria?

Using professional mold air testing and surface spore collection, the best can identify Alternaria fungus. In addition, the ERMI test detects Alternaria alternata, one of 36 mold species. An indoor air quality test developed by the EPA and HUD, the Environmental Relative Moldiness Index (ERMI) measures the amount of mold spores present in a given area. ERMI was created to be a standardized method of evaluating indoor air quality and mold growth in U.S. dwellings. In order to determine which mold species are harmful and linked to water damage, it makes use of DNA-based technologies. It can also be used to estimate the number of items in a collection.

How to Remove and Prevent Alternaria Mold

The first step in getting rid of Alternia mold is to find and dry out any places in your house that have a lot of moisture. New mold will be less likely to form and existing mold will spread as a result of these measures. Keep your doors and windows closed in the spring and summer to avoid bringing in Alternaria spores from the outside. A heat recovery ventilator (HRV) can help enhance indoor air quality and reduce mold growth by providing ample ventilation. Use a non-toxic fungicide if you can locate visible mold. Consider contacting a mold removal crew if you don’t detect any mold but suddenly get asthmatic symptoms or other respiratory concerns.

If you discover any sign of Alternaria mold infestation, indoors or out, you should take immediate action to get rid of it.

If you suspect a mold problem, your first step should be to conduct an inspection. Make the most of expert mold inspectors’ free services by learning how to acquire a free mold test.

Do not attempt to investigate the mold on your own without proper safety equipment. As a result, you won’t come into contact with the Alternaria mold.

Prepare a cleaning solution after inspecting and protecting yourself. Depending on the severity of the mold infection, use different cleaning methods.

A vinegar solution is all you need if you think you have a little mold problem. Spray the moldy area with a solution made from equal parts water and vinegar in a spray bottle.

Instead of using a vinegar solution that will undoubtedly kill the mold if the problem is worse than expected, try a more specific mixture. All you need is water, detergent, and bleach.

All you have to do with the second solution is to combine all of the ingredients. To get rid of Alternaria mold, you’ll need the proper amount of each ingredient.

Once the cleaning solution has been applied, begin scrubbing the area. To get rid of the scrubbing molds, wash everything in hot, soapy water.

Throw away the Alternaria mold if you can’t remove it with a specified material. Keep in mind that mold will eventually spread and cause more serious issues if you don’t take action now.

Anti-mold stickers, on the other hand, can help you avoid a second mold problem. If you click on the link, you’ll find a useful suggestion on how to use anti-mold stickers.

DIY Mold Cleaning Methods

Household disinfectants work well to get rid of allergic mold if you catch it early. To prevent the spread of spores, always use these products in an area with good ventilation and use gloves, goggles, and old clothes that can be washed in hot water.

  • Regular home bleach or sodium hypochlorite works best for destroying mold and removing any stains. It’s abrasive, so dilute it before using it.
  • Hydrogen peroxide (three to ten percent solution) is a milder alternative to chlorine bleach for killing mold and lightening stains. If you’re looking for a fast and safe method of removing stains, this is a good option.
  • Acidic vinegar kills mold by slowly dissolving its cell structure and causing it to disintegrate. It’s not harmful, but it may leave mold spots that need to be removed with a home cleaning and further vinegar scrubbing.
  • Borax and sodium bicarbonate (baking soda) both have a high pH that prevents mold from growing or surviving in the environment. All you have to do is add water to make them both work. Borax is more effective than baking soda, but it isn’t as effective as a more powerful cleaner.

Hire a Professional

Toxic or significant mold problems necessitate the services of a specialist.


This rule of thumb states that for every 10 square feet of mold infestation, a professional should be called in to remove it. Removing big mold colonies necessitates the use of powerful chemicals and the obtaining of special licenses for the disposal of afflicted construction components. To get help with mold testing and removal, contact your local public health department.

All the molds that could be present in your home are listed here, as well as how to tell them apart.

Alternaria: An Indoor Air Quality Contaminant - YouTube



Moisturizing pink, grey, orange, or white moist mold typically begins as a small colony and then powders.


For example, they can be seen around dripping windows and humidifiers. A specialist is needed to get rid of it because it’s typically detected with Strachybotrys (black mold).



Velvety texture with projecting “hairs” in dark green or brown.


Shower stalls, bathtubs, and near sinks are the most common locations. In most cases, its presence indicates that there has been water damage, and mold will swiftly spread. It is possible to safely remove the colony, if it hasn’t grown too large, with adequate washing.



Often has spores that can grow into thick layers of mold that are grey or green in color. Multiple Aspergillus species, on the other hand, can exhibit a wide range of colors.


This fungus is frequently seen on wood surfaces. A professional exterminator is required for a serious infestation.



Initially a pink, brown or black mold, but as it grows and matures, it turns dark brown.


Find it in damp and dark places like carpets, beneath wallpaper, and on wooden surfaces that have been damaged by water. Clean-up of tiny infestations necessitates the use of eye protection and gloves.



As they mature, mold spores turn from white to gray, brown, or black. A musty odor distinguishes this scent.


Water-damaged walls, wooden surfaces, wallpaper, and damp carpet and roof shingles are also ideal habitats for this invasive species. Removal is best left to the experts, as it is sometimes mistaken for black mold.



It’s brown or olive green in color and may be found in both cold and warm climates. It has a suede-like texture.


Carpet, furniture, curtains, and the undersides of floorboards are common places to find it. A homeowner can remove small colonies; but, a professional will be needed to handle bigger ones.



Development occurs in a variety of colors.


Infestations can be discovered in carpets, wallpaper, and other water-damaged materials, which spread swiftly. Any cleanup should be approached cautiously.



It spreads rapidly, resulting in large swaths of moldy growth.


Condensation-filled areas, such as those around air conditioners, HVAC ducts, and water-damaged windows and doors, are prime candidates for this mold. Allergens can be removed from tiny areas by the homeowner. Larger infections necessitate the services of a trained medical expert.



The mold colony’s velvet-like surface is blue-green in color and velvety. The mold quickly spreads.


Often found in HVAC ducts, wallpaper, beds, and carpets… Homeowners can safely clear small colonies. Professionals should be called in to deal with larger infestations.



A dark green or black slimy texture characterizes the colony, which is known as black mold.


It’s most commonly discovered in places inside a house that’ve been submerged in water or have been very humid for an extended period of time. Wood is the most common substrate for the growth of mold and mildew. Professionals are required to remove and properly dispose of any damaged construction materials.



Colonies of white and green wooly colonies are the most common form.


Surfaces with a high moisture content, such as wallpaper, carpet, and clothing, are good candidates for this fungus. Cleansing Trichoderma can be done by the homeowner with sufficient safety precautions. However, it does create an enzyme that is capable of causing harm to wood, fabrics, and paper as well as the foundations of buildings.



Usually black and clump-like in appearance.


Usually found in water-damaged or persistently moist regions of kitchens, bathrooms, and basements. A homeowner can clean up the mess if they are alerted in time.


How do you prevent Alternaria molds?

On the auto option of your HVAC, you can maintain the humidity level in your home lower. Additionally, dehumidifiers can be used for basements, which have a tendency to be more humid than other regions. As far as possible, keep humidity levels low; measurements should not exceed 45 to 50 percent.

Does vinegar kill Alternaria mold?

One of the most effective ways to get rid of mold is to use distilled white vinegar. It’s not harmful, but it may leave mold spots that need to be removed with a home cleaning and further vinegar scrubbing.

Is Alternaria mold toxic to humans?

Mycotoxins produced by Alternaria species are known as Alternaria toxins. Many crops, including grains, oil seeds, and fruits, are infected by these fungus. Many Alternaria toxins have been identified, however only a few have been characterized in terms of their physical and chemical properties.

How do you prevent Alternaria Alternata allergy?

Do not rake or burn dry leaves unless you wear a face mask to protect your health. Avoid hay, straw, and peat moss in barns, silos, and other structures. Use a certified allergy and asthma-friendly filter attachment on your HVAC system and replace filters on a frequent basis.

What are the symptoms of Alternaria?

Yellow, dark brown or black circular leaf patches with target-like concentric rings are the most prevalent symptoms of Alternaria infections. Leaf spots may have a shot-hole appearance if the lesion cores fall out. Leaf drop can occur when necrotic spots merge into larger areas.

Which Molds Are Dangerous? | IQAir

How do you get rid of chaetomium?

Remove, sand, or replace the troublesome material. This is what people tell you to do: spray it with vinegar or a water/bleach solution, but that simply gets rid of surface mold; it doesn’t go to the root of the problem. WARNING: It can be released into the air by irritating mold.

Is vinegar better than bleach for mold?

How Effective Is Vinegar Against Mold? Vinegar is far superior to bleach when it comes to killing mold. Except in exceptional circumstances, the Environmental Protection Agency (EPA) does not advise the use of bleach for the purpose of killing or removing mold. Even when bleach is used, there will still be “a low quantity of mold spores” in the air.


Alternaria mold, often known as outside mold, is one of the many types of mold. There are many different kinds of this mold.

The answer to the question, “where does Alternaria mold grow?” may be found at the top of this page. They’re easy to detect whether you’re outside or inside.

In addition to causing major health issues, it can form anywhere, especially in the open air. Remove the Alternaria mold as soon as possible to avoid any problems.

Helen Skeates

Helen Skeates

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