Brown Spots On Avocado Leaves: Try This!

Avocados are simple to take care of, but you might need to spend more time on them if you have other obligations. Or else, you may be unaware that the leaves of your avocado plants have brown stains.

But what exactly makes avocado leaves to have brown spots? Excessive water supply and exposing the avocados to direct sunlight are some undeniable procedures that may be causing brown spots to appear on avocados leaves. There are many reasons why avocado leaves darken. To explore the causes and remedies, keep reading.

How to Recognize Brown Spots on Avocado Leaves?

It’s important to know how to notice brown spots on your avocado plant before diving into the causes.

Usually, a fungus or pest infestation is what causes those brown marks.

You’ll first see little brown spots resembling dots under your plant’s leaves. The leaf will quickly develop those spots on the top, which will cause it to become chlorotic and wither.

The bark and stalks of your avocado plant may occasionally become heated by the sun when parts of the leaves start to wither, which might result in sunburn damage.

What Causes Brown Spots on Avocado Leaves?

Brown Spots On Avocado Leaves: Try This!

Although it is simple to deduce that bugs are to blame for the brown spots on your avocado plant’s leaves, you also need to consider other potential problems.

  • Algal Leaf Spot On Avocado

The only infected algae capable of causing plant disease, Cephaleuros Virescens, is what causes this infection. This parasite decreases your plant’s capacity for photosynthesis, which results in brownish-rust patches that often begin on the leaves of your avocado plant and sooner spread to the stems and twigs.

Along with the symptoms, you may also notice some patches on the underside of your plant’s yellow or green leaves. Although it may appear catastrophic, if properly treated, this illness won’t cause any additional harm to your plant save the obvious decline in its appearance.

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What Is Treatments For Algal Leaf Spots?

Placing your plant in a hot environment, preferably near a window, will shorten the lifespan of the plaguing algae. Algal leaf spot disease is highly dependent on moist areas of your avocado to survive. Verify your plant’s drainage to ensure there isn’t too much water in the pot.

Pruning is a great approach to getting rid of damaged leaves so that new leaves can start to sprout in their place. Pruning will also create a space for air to flow, which will speed up the drying process for the bark and stems of your plant.

Using copper fungicide once weekly, you can stop new brown spots from obliterating your avocado’s attractiveness.

  • Fungal Diseases

Undrained pots and a humid climate, which contribute to increased moisture in your plant, are the usual reasons for a fungal outbreak on your avocado plant. Fungi will likely develop and quickly infest your avocado plant in that damp environment. The dark stains on your avocado leaves could be combined with various fungi.

  • Anthracnose

The avocado’s leaves are affected by this illness. In addition to brown patches, the usual apparent symptoms include significant leaf drops and some leaves that appear burnt.

  • Leaf Spot On Septoria

This leaf mark was brought on by the fungus septoria, which regularly affects vegetables and crops.

In humid settings, this typically happens on the bottom leaves of the plant. Numerous brown patches under your plant’s leaves and yellowing or withering foliage are signs of this illness.

Treatments For Anthracnose

It is advisable to keep your plant isolated from other plants if it is experiencing any fungal infections to prevent the infestation from spreading.

  • Get rid of any diseased spots right away in your rubbish can.
  • Examine the drainage system and drain any extra water.
  • Allow your plant to receive enough sunlight to speed up the drying process.
  • Directly apply fungicide to the leaves in which the infection is occurring.
  • Alternaria Leaf Blight

They flourish in warm, humid conditions and during wet, rainy seasons. This illness is caused by Alternaria. The mature leaves of your plant show symptoms. It will initially manifest as little brown dots with a yellow surround. The leaves will wither and become brown if nothing is done.

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Diaper Mildew Early in the spring, when it is chilly and humid, this illness is prevalent. Through spores, the pathogen spreads. The leaves will have a grey cotton-like substance underneath and yellow and white patches on top. The spots on your leaves will ultimately turn brown and fall off.

Treatments For Alternaria Leaf Blight

You can spray copper-based fungicides on your avocados once a week if you think they have Alternaria Leaf Blight. Stop watering your avocado plant right away, or cut back on it. To stop moisture from building up on the leaves, try to avoid sprinkling or spraying water over your plant as much as possible.

Reduce fungal infection on other leaves by pruning your plant to improve air circulation. Add a layer of organic material compost to prevent spores from returning to your avocado plant. Maintain cleanliness by disinfecting all of your instruments and getting rid of any diseased Avocado components.

  • Particle Mildew

It hinders photosynthesis from taking place. A hot, dry climate is preferred by powdery mildew. Dust on top of the leaves resembling flour is one symptom. The result could be leaf disfigurement.

Treatments For Particle Mildew

Make sure to clear the area around your plant of any debris before doing so. You should space your plants 3 to 5 inches apart to avoid the spread of fungus spores. Consider transferring your plant to a medium- to the high-temperature region if your flat has a humid atmosphere.

Do not water your avocado using overhead irrigation to keep the leaves dry and clear from moisture. Copper-based fungicides should be applied once per week. Because it will take longer for the remedy to dry, avoid using fungicide during the wet season.

  • Bacterial Diseases

Bacterial infections in your avocado plant are another important factor for which you need to look. Avocados typically only succumb to fungal infections rather than bacterial invasions. However, your plant may undergo bacterial soft rot during warm, humid seasons. The plant’s structure can disintegrate due to this bacterial disease since it attacks the pectate molecules directly.

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How Do Bacteria Enter Avocado Leaves?

Brown Spots On Avocado Leaves: Try This!

Naturally, insects transport these bacteria from one plant to the next. Then, it will go inside your plant through open wounds typically brought on by tools or other organic holes. The short browning of your plant’s leaves and the emergence of water-soaked areas and yellowish-brown spots are typical symptoms you will observe. You’ll also smell something strongly offensive from your plant’s leaves.

There is currently no known treatment to keep your avocado plant alive after the tissue has already been afflicted by this bacterial disease. Propagating your plant is the finest thing you can do to keep it alive in some way.

How to Stop Brown Spots on Avocado Leaves?

As annoying as it may be, dealing with brown spots on your avocado plant requires much effort, patience, and understanding if you want to effectively preserve your plant from that catastrophe. The easiest strategy to avoid that circumstance is to take sensible precautions that could stop the sources of brown spots from entering your home.

  • As a general rule, always properly inspect the plant before purchasing and taking it home.
  • Your avocado plant will benefit from ample and moderate sunlight.
  • Keep your plant away from a humid atmosphere.
  • Your plant has to be watered properly for it to grow. To avoid bacterial and fungal infestation, avoid overhead watering.
  • Keep your pot’s drainage system in good working order to avoid waterlogging.
  • Avoid overfertilizing your avocado plants. Use an appropriate soil testing kit to determine the required nutrients as feasible.
  • If things go very bad, use proper propagation.
  • Last but not least, don’t forget that cleanliness is the key to prevention. After each usage, disinfect your instruments, give your hands a good wash, and properly dispose of any plant waste.


Your home would benefit greatly from having avocado. It will enhance your home’s atmosphere with oval leaves and sparkling texture. Although it is occasionally known for this plant to have brown spots, if you have the right knowledge and treatment, dealing with it is reasonably doable.

Before using any remedies, be sure your avocado is experiencing these brown patches. Never forget that for your avocado plant to thrive, you must give it care and patience.