Lycopersicon esculentum White Powder - Causes & Fixes

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Powdery Mildew

This fungal disease, caused by Oidium neolycopersici, manifests as white, flour-like patches on the upper surfaces of tomato leaves. It thrives in high humidity and moderate temperatures, eventually causing leaves to yellow and drop.

Very Common

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How to confirm: Inspect the undersides of leaves for fine white mycelium spreading from the spots.

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1 Apply an organic fungicide to eliminate the existing fungal spores and prevent further spread across the tomato foliage.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

2 Prune and dispose of heavily infected leaves to reduce the fungal load and improve airflow around the plant.

3 Increase air circulation and avoid overhead watering to ensure the leaves remain dry, as high humidity promotes mildew growth.

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Whiteflies

Infestations of whiteflies can leave a sticky, white-looking residue or a fine dust of eggs/exuviae on the undersides of tomato foliage. These insects also excrete honeydew, which can promote secondary sooty mold growth.

Common

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How to confirm: Gently shake the plant to see if small, white flying insects emerge from the leaf undersides.

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shopping_cart Recommended Products

1 Apply an organic insecticide to eliminate adult whiteflies, larvae, and eggs on the undersides of leaves.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Deploy yellow sticky traps to capture flying adults and monitor the population levels.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

In Stock

3 Wipe the foliage with a damp cloth to remove the sticky honeydew residue and prevent secondary mold growth.

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Mineral Deposits (Salt Buildup)

Excessive use of fertilizers or hard water can lead to white, crusty mineral deposits on the soil surface or near the base of the tomato stem. This is not a biological pathogen but a physiological issue related to irrigation.

Common

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How to confirm: Check if the white substance is crunchy/crystalline and if it is localized strictly to the soil surface.

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1 Flush the soil thoroughly with distilled or filtered water to leach out accumulated mineral salts from the root zone.

2 Monitor soil hydration levels more closely to prevent future salt accumulation by using a moisture meter.