Pisum sativum White Powder - Causes & Fixes

Jump to cause: Powdery Mildew Whiteflies Salt Accumulation

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Powdery Mildew

This fungal disease, caused by species such as Podosphaera vulgata, manifests as white, flour-like patches on leaves and stems. It thrives in high humidity with moderate temperatures, common in pea crops.

Very Common

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How to confirm: Inspect the undersides of the leaves for fuzzy white growth that spreads across the surface.

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1 Apply an organic fungicide to eliminate the fungal spores and prevent the disease from spreading to healthy leaves.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

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2 Prune and remove any heavily infected leaves or stems to reduce the fungal load in the plant area.

3 Improve air circulation around the pea plants and avoid overhead watering to lower humidity levels around the foliage.

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Whiteflies

While not a powder themselves, colonies of whiteflies can leave behind honeydew and sooty mold or appear as white specks on the leaf surface. They suck sap from the pea plant, weakening the foliage.

Common

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How to confirm: Gently shake the plant to see if a cloud of tiny white insects emerges from the leaves.

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1 Apply an organic insecticide to eliminate whitefly adults, larvae, and 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 pea plants to capture flying adults and monitor the infestation level.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

$7

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

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Salt Accumulation

High levels of soluble salts in the soil or irrigation water can crystallize on the leaf surface as it evaporates. This can appear as a fine white crust, especially in young pea shoots.

Common

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How to confirm: Check if the white residue dissolves easily when touched with a damp cloth.

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1 Flush the soil thoroughly with large amounts of fresh, low-mineral water to leach out the accumulated soluble salts from the root zone.

2 Monitor soil moisture levels closely to prevent future salt buildup by ensuring the soil does not stay overly saturated or dry out excessively.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

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3 Apply a balanced organic fertilizer to restore nutrient availability, as salt buildup often interferes with the plant's ability to uptake essential minerals.