Rosmarinus officinalis Fine Webbing - Causes & Fixes

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Two-Spotted Spider Mites

These tiny arachnids thrive in the hot, dry conditions that Rosemary prefers, feeding on the undersides of needles and leaving characteristic fine silk webbing. As they feed, they remove chlorophyll, causing the rosemary needles to turn pale or develop stippled yellow spots.

Very Common

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How to confirm: Hold a white piece of paper under a rosemary branch and tap the foliage to see if tiny moving dots fall onto it.

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shopping_cart Recommended Products

1 Apply an organic insecticide spray to the plant, ensuring you thoroughly coat the undersides of the leaves to eliminate the mites and their eggs.

Bonide Captain Jack's Neem Oil 32 oz

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2 Increase local humidity and reduce dry heat around the rosemary by misting the foliage or using a pebble tray to make the environment less hospitable for spider mites.

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3 Prune and dispose of heavily infested or dead needles to prevent the mites from spreading to other parts of the plant or nearby greenery.

Fiskars 5/8" Bypass Pruning Shears

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Tetranychus urticae (European Red Spider Mite) Infestation

A specific subset of spider mites that can cause heavy webbing across entire rosemary sprigs, especially when the plant is stressed by drought. The webbing acts as a protective microclimate for the mites to lay eggs.

Very Common

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How to confirm: Inspect the undersides of older needles for tiny reddish or orange dots which indicate mite eggs or nymphs.

build How to fix it

shopping_cart Recommended Products

1 Apply an organic insecticide spray to eliminate existing mites, larvae, and eggs on the rosemary sprigs.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Increase humidity and reduce plant stress by ensuring consistent moisture levels, using a moisture meter to prevent drought conditions.

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3 Prune and dispose of heavily infested or dead sprigs to reduce the mite population and prevent further spread.

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Thrips Infestation

While thrips are primarily known for silvery scarring on rosemary leaves, their presence can sometimes be accompanied by light silken strands in dense foliage. They feed on the succulent parts of new growth, causing distorted needles.

Common

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How to confirm: Look for very small, slender black or yellowish insects crawling near the base of new needle growth.

build How to fix it

shopping_cart Recommended Products

1 Apply an organic insecticide spray to the foliage to eliminate existing thrips and prevent further feeding on new growth.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Prune away any heavily distorted or damaged new growth to reduce the pest population and improve airflow.

Fiskars 5/8" Bypass Pruning Shears