Asplenium nidus Fine Webbing - Causes & Fixes

Jump to cause: Two-Spotted Spider Mites Broad Mites Low Humidity and Desiccation

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Two-Spotted Spider Mites

Spider mites thrive in the low-humidity environments common for Bird's Nest Ferns. They pierce plant cells to suck sap, leaving behind fine silk webs and causing the fronds to appear stippled or bleached.

Very Common

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

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

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2 Increase ambient humidity around the fern by using a pebble tray or a fine misting bottle to create an environment less favorable to mite reproduction.

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3 Gently wipe the underside of the fronds with a damp cloth to physically remove webbing and any visible mites from the plant surface.

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Broad Mites

While they do not produce large webs, broad mites can cause microscopic damage that results in distorted, stunted, or 'web-like' appearance of new frond growth. This is common in greenhouse-grown Asplenium.

Common

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How to confirm: Inspect the center of the 'nest' (the crown) for any puckering, distortion, or curling of emerging new fronds.

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1 Isolate the plant immediately from other greenery to prevent the mites from spreading to healthy plants.

2 Apply an organic miticide/insecticide spray to the plant, ensuring you coat the undersides of fronds and any new growth where mites hide.

Bonide Captain Jack's Neem Oil 32 oz

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3 Prune and discard any heavily distorted or stunted fronds that show significant damage to reduce the mite population.

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Low Humidity and Desiccation

Extreme lack of moisture can cause the fine hairs on the underside of some fern varieties to clump or create a dusty appearance that mimics webbing. It often accompanies crispy, brown leaf edges.

Common

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How to confirm: Check if the leaf margins are turning brown and brittle alongside the presence of the webs.

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1 Increase local humidity around the fern to prevent further leaf desiccation and mimic its natural tropical environment.

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2 Place a pebble tray or use a humidifier near the plant to maintain consistent moisture levels in the air.