Tomato Leaf Mold: Symptoms & Treatment Guide (2026)

It’s an olive brown fungus, which inhabits the lower side of the leaves.

_{Leaf mold fungi on the backside of the leaf}

On the upper side appear yellow spots.

_{Yellow spots on the upper side of the leaf as a symptom to the leaf mold fungi being under}

If not taken care of, these leaves will drop off.

For further information about this, read this post , and this post also.

There are 2 ways to eliminate leaf mold: Chemical, and organic.

Chemical:

Best pesticides for Leaf mold,

Active ingredients:

Organic:

Bacillus Subtilis

A biological fungicide containing a strain of the bacterium Bacillus subtilis.

The bacterial spores occupy space on the plant surface, and compete with the pathogens; then active compounds called lipopeptides, produced by the bacterium, disrupt the germination, and growth of invading pathogens.

Due to this action, resistance is not likely to develop.

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Neem oil

A naturally occurring pesticide, found in seeds from the neem tree.

Azadirachtin is the most active component here.

It reduces insect feeding and acts as a repellent.

It also interferes with insect hormone systems, making it harder for insects to grow and lay eggs.

Hydrogen peroxide –

Well known as an ingredient in disinfectant products, it’s now also approved for controlling microbial pests, on crops growing indoors and outdoors, and on certain crops after harvest.

This active ingredient prevents, and controls bacteria, and fungi by destroying essential components of the cells.

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