Citrus reticulata Sticky Leaves - Causes & Fixes

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Aphid Infestation

Aphids are sap-sucking insects that congregate on tender new growth of Mandarin trees, excreting a sugary substance known as honeydew. This sticky residue coats the leaves and can lead to secondary fungal growth.

Very Common

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How to confirm: Inspect the undersides of young leaves and terminal buds for small, pear-shaped green or black insects.

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1 Apply an organic insecticide to eliminate the aphid population and stop the production of honeydew.

Bonide Captain Jack's Neem Oil 32 oz

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2 Gently wipe the sticky residue off the leaves with a damp cloth to prevent secondary fungal growth and allow the plant to breathe.

3 Monitor the plant regularly using a spray bottle to maintain moisture and check for new pests.

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Scale Insects

Scale insects attach themselves to the stems and leaves of Citrus reticulata, piercing the plant tissue to feed on sap. Like aphids, they produce honeydew as a metabolic byproduct which creates a visible sticky film.

Very Common

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How to confirm: Look for small, immobile bumps or waxy bumps on the branches and leaf petioles that can be scraped off with a fingernail.

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shopping_cart Recommended Products

1 Apply an organic insecticide spray to the leaves and stems to kill existing scale insects and their eggs.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Wipe the sticky honeydew residue off the leaves with a damp cloth to prevent fungal growth and allow the plant to breathe.

3 Inspect the undersides of leaves and crevices for any remaining pests and treat with a targeted spray if necessary.

Bonide Captain Jack's Fruit Tree Spray 32 oz

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Whitefly Infestation

Whiteflies inhabit the undersides of Mandarin leaves and suck the plant's nutrients, leaving behind a sticky residue. A tell-tale sign is a cloud of tiny white insects that fly up when the foliage is disturbed.

Common

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How to confirm: Tap a branch over a white piece of paper to see if tiny white moths emerge from the leaf undersides.

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shopping_cart Recommended Products

1 Apply an organic insecticide to eliminate the whitefly population on the leaves and undersides of foliage.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Deploy yellow sticky traps around the plant to capture flying adults and monitor the infestation level.

Super Ninja Fungus Gnat Traps - 30 Pack

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3 Wipe the sticky residue off the leaves with a damp cloth to prevent sooty mold growth and allow the plant to breathe.

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Sooty Mold (Secondary Infection)

While not the primary cause of stickiness, Sooty Mold is a dark fungus that grows specifically on the honeydew left by pests. It can thicken the sticky residue and eventually coat the leaves in a black, crusty layer.

Common

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How to confirm: Check if the sticky residue is accompanied by a dark, velvety black coating that obscures leaf visibility.

build How to fix it

shopping_cart Recommended Products

1 Identify and eliminate the underlying pests (such as aphids or scale) that are producing the sticky honeydew by applying an organic insecticide.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Gently wipe the black, crusty mold off the leaves using a soft cloth and water to restore the plant's ability to photosynthesize.

3 Apply a horticultural oil or neem oil spray to the foliage to act as a fungicide and prevent the mold from returning.