Glycine max White Powder - Causes & Fixes

Jump to cause: Soybean White Mold (Sclerotinia sclerotiorum) Powdery Mildew Soybean Cyst Nematode (Secondary symptom)

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Soybean White Mold (Sclerotinia sclerotiorum)

This fungal pathogen produces a white, cottony mycelium on the stems and leaves of soybean plants, often leading to stem decay and sclerotia formation.

Very Common

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How to confirm: Look for hard, dark brown/black mustard-seed-like structures (sclerotia) buried within the white fuzzy mass.

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1 Immediately remove and destroy all infected plant material and sclerotia to prevent the fungal spores from spreading to healthy plants.

2 Apply an organic fungicide to control the spread of the white mycelium on remaining healthy tissues.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

3 Improve air circulation and reduce humidity around the plant base by thinning dense foliage and avoiding overhead watering.

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Powdery Mildew

Various fungal species can cause white, talcum-like patches on the surface of soybean leaves, which can reduce photosynthetic capacity and leaf longevity.

Common

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How to confirm: Inspect if the white patches appear as distinct circular spots that spread across the leaf surface without causing stem rot.

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1 Apply an organic fungicide to the affected leaves to eliminate the fungal spores and prevent further spread.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Improve air circulation around the soybean plants by pruning crowded foliage and ensuring they are not too close to other plants.

3 Avoid overhead watering, which can spread fungal spores, and instead water at the base of the plant to keep leaves dry.

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Soybean Cyst Nematode (Secondary symptom)

While nematodes don't produce powder, severe infestations cause stunting and chlorosis that can sometimes lead to secondary fungal colonization on decaying tissue.

Common

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How to confirm: Check for small, lemon-shaped cysts attached to the roots of the soybean plant.

build How to fix it

shopping_cart Recommended Products

1 Apply a fungicide to treat the secondary fungal colonization and prevent further spread of the white powder on plant tissue.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

2 Inspect the root system for characteristic cysts (small, hard bumps) to confirm nematode presence and prevent further infestation in the soil.

3 Improve soil drainage and aeration by incorporating perlite to reduce the moisture levels that favor secondary fungal growth.