Brassica chinensis Fine Webbing - Causes & Fixes

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Two-Spotted Spider Mite Infestation

Spider mites are the most common cause of fine webbing in Brassica chinensis, typically appearing when the environment is hot and dry. They feed on the undersides of leaves, causing stippling (tiny white dots) followed by silk webs that can cover entire leaf clusters.

Very Common

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How to confirm: Hold a white piece of paper underneath a leaf and tap the leaf sharply to see if tiny crawling specks fall onto the paper.

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1 Immediately spray the plant with an organic miticide to eliminate the spider mite population and destroy eggs.

Bonide Captain Jack's Neem Oil 32 oz

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2 Increase humidity around the plant and ensure the soil remains moist, as spider mites thrive in hot, dry conditions.

Flora Premium Plant Mister

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3 Prune and dispose of heavily infested or webbed leaves to prevent the mites from spreading to healthy parts of the plant.

Fiskars 5/8" Bypass Pruning Shears

Cutting Tools

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Broad Mite Infestation

While broad mites do not produce large webs, their feeding can cause leaf distortion and a fine, dust-like appearance that can be mistaken for webbing in young Pak Choi. This often results in stunted growth and 'cupping' of the leaf margins.

Common

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How to confirm: Examine the new growth for extreme curling or puckering of the leaves even in the absence of visible webs.

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shopping_cart Recommended Products

1 Apply an organic insecticide spray to eliminate mites and their larvae on the leaf surfaces.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Prune and dispose of heavily distorted or stunted leaves to prevent the infestation from spreading to healthy growth.

3 Monitor soil moisture levels closely, as mites thrive in environments that cause plant stress.

GROWIT Soil Moisture Meter - Blue

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High Humidity/Fungal Hyphae

In extremely high humidity, certain fungal pathogens can develop fine, thread-like mycelium that mimics spider webbing across the surface of the leaves. This is often accompanied by localized softening or browning of the leaf tissue.

Common

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How to confirm: Check if the 'webbing' disappears when wiped with a damp cloth and if there are any dark, water-soaked spots nearby.

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shopping_cart Recommended Products

1 Apply an organic fungicide to eliminate the fungal hyphae and prevent the spread of the pathogen.