Begonia tuberhybrida Sticky Leaves - Causes & Fixes

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Aphid Infestation

Aphids are sap-sucking insects common in Tuberous Begonias that excrete 'honeydew,' a sticky, sugar-rich substance. This residue often attracts ants and can lead to the growth of black sooty mold on the leaves.

Very Common

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How to confirm: Inspect the undersides of leaves and new growth for tiny, pear-shaped insects or clusters of eggs.

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1 Spray the plant thoroughly with an organic insecticide to eliminate the aphid population and stop the production of honeydew.

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2 Wipe the sticky residue and any visible sooty mold off the leaves using a soft cloth dampened with water to allow the plant to breathe.

3 Monitor the plant for any returning pests and use yellow sticky traps to capture any newly emerged winged aphids.

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Scale Insects

Scale insects attach themselves to Begonia stems and leaves, piercing plant tissue to feed on sap. Like aphids, they secrete honeydew that creates a tacky film on the leaf surface.

Very Common

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How to confirm: Look for small, hard, brownish bumps stationary on the stems or leaf veins that can be scraped off with a fingernail.

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

Bonide Captain Jack's Neem Oil 32 oz

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2 Wipe the sticky leaves and stems with a soft cloth soaked in water or insecticidal soap to remove the honeydew residue.

3 Inspect nearby plants and use a targeted spray to prevent the infestation from spreading.

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Mealybugs

Mealybugs are soft-bodied pests that thrive in the humid environments preferred by Begonias. Their feeding process results in sticky residue and white, cottony masses in leaf axils.

Common

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How to confirm: Search for small, white, waxy patches nestled where the leaf meets the stem.

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1 Isolate the plant immediately to prevent the spread of mealybugs to other houseplants and treat the infestation with an organic insecticide.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

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2 Use a cotton swab dipped in isopropyl alcohol to manually remove visible white, cottony masses from the leaf axils and stems.

3 Wipe the sticky residue from the leaves using a soft cloth and water to help the plant breathe and prevent fungal growth.

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Excessive Liquid Fertilizer

Over-application of water-soluble fertilizers can lead to salt buildup on the leaf surface. As water evaporates from the Begonia leaves, concentrated mineral and nutrient salts are left behind as a sticky residue.

Common

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How to confirm: Check if the stickiness is accompanied by white, crusty mineral deposits on the soil surface or leaf edges.

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1 Gently wipe the leaves with a soft, damp cloth to remove the sticky salt residue and prevent further leaf damage.

2 Flush the soil thoroughly with plain, room-temperature water to leach out excess mineral salts from the root zone.