Capsicum baccatum Cubana White Powder - Causes & Fixes

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Powdery Mildew

This fungal disease is common in Capsicum species when humidity is high and airflow is restricted. It manifests as white, flour-like patches on the surface of leaves, eventually causing them to yellow and drop.

Very Common

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How to confirm: Inspect the underside of the leaves for fuzzy white mycelium that cannot be wiped off easily.

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1 Apply an organic fungicide to eliminate the fungal spores on the leaf surfaces.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

2 Prune and remove any heavily infected leaves to prevent the spread of spores to healthy foliage.

3 Improve air circulation around the plant and reduce humidity by spacing plants further apart.

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Whiteflies

Infestations of whiteflies can leave a fine white residue or 'dust' on the undersides of foliage. These insects also excrete honeydew, which can lead to secondary growth of black sooty mold.

Common

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How to confirm: Gently shake a branch over a white surface to see if small flying insects emerge from the leaves.

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1 Apply an organic insecticide to eliminate the whitefly population and kill larvae/eggs on the foliage.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Deploy yellow sticky traps near the plant to capture adult whiteflies and prevent further reproduction.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

$7

In Stock

3 Wipe the undersides of the leaves with a damp cloth to remove the white residue and prevent secondary sooty mold growth.

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Mealybugs

These sap-sucking pests produce a white, waxy, cottony coating that can look like powder or fluff on stems and leaf axils. They cause stunted growth and leaf distortion in pepper plants.

Common

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How to confirm: Use a magnifying glass to look for small, immobile white clusters tucked into the nodes of the plant.

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1 Isolate the pepper plant immediately to prevent the mealybugs from spreading to other plants in your collection.

2 Treat the infestation by spraying the plant with an organic insecticide/miticide to eliminate the white, waxy pests.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

3 Wipe away visible cottony clusters from stems and leaf axils using a cotton swab dipped in isopropyl alcohol.

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Calcium Deficiency (Salt Residue)

While not a biological pathogen, dried mineral deposits from hard water or over-fertilization can appear as white crusty powder on leaf edges or soil surfaces. This often coincides with blossom end rot in peppers.

Common

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How to confirm: Check if the white patches are localized to the edges of leaves or the soil surface and if they feel gritty.

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1 Flush the soil with distilled or rainwater to wash away accumulated mineral salts and prevent further calcium-related issues like blossom end rot.

2 Apply a calcium supplement to strengthen cell walls and combat deficiency symptoms.