Crassula mesembryanthoides ssp. hispida Sticky Leaves - Causes & Fixes

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Aphid Infestation

Aphids are small, soft-bodied insects that pierce the succulent tissues of Crassula to suck sap, excreting a sugary substance known as honeydew. This residue creates the characteristic sticky film on the leaf surfaces.

Very Common

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How to confirm: Inspect the undersides of the 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 Gently wipe the sticky residue off the leaves using a soft cloth or cotton swab dipped in water to prevent fungal growth.

3 Place yellow sticky traps near the plant to capture any remaining flying aphids and monitor for new arrivals.

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Scale Insects

Scale insects attach themselves to the stems or leaves of this species and secrete honeydew as they feed on plant fluids. Over time, the sticky residue can accumulate significantly on the foliage.

Very Common

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How to confirm: Look for small, immobile bumps or waxy shields on the stems that do not move when prodded with a fingernail.

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1 Treat the plant with an organic insecticide spray to eliminate existing scale insects and their eggs.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

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2 Wipe the leaves and stems with a damp cloth to remove the sticky honeydew residue and prevent fungal growth.

3 Inspect nearby plants to ensure the infestation has not spread, and isolate the affected Crassula.

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Mealybugs

Mealybugs are pests that thrive in the crevices of succulent plants like Crassula, producing honeydew as a byproduct of feeding. They are often accompanied by white, cottony masses.

Common

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How to confirm: Search for small, white, fluffy patches tucked into the leaf axils or near the base of the plant.

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1 Isolate the plant immediately to prevent the spread of mealybugs to other houseplants and use a cotton swab dipped in isopropyl alcohol to manually remove visible white cottony masses.

2 Apply an organic insecticide spray to the entire plant, ensuring you reach the crevices and undersides of the leaves to eliminate remaining pests and larvae.

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3 Wipe away the sticky honeydew residue from the leaves with a soft cloth to prevent fungal growth and allow the plant to breathe.

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Sooty Mold

While not the primary cause, sooty mold is a black fungus that grows directly on the sticky honeydew left behind by sap-sucking insects. It can eventually coat the hairy leaves of the plant in a dark, dusty layer.

Common

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How to confirm: Observe if there is a black, velvety coating present specifically on top of the sticky residue.

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1 Identify and eliminate the underlying sap-sucking insects (such as aphids, scale, or mealybugs) that are producing the sticky honeydew.

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2 Gently wipe the black sooty mold off the hairy leaves using a soft cloth or cotton swab dipped in water to prevent the fungus from blocking light.

3 Monitor soil moisture levels to ensure the plant is not overwatered, as excess moisture can stress the plant and make it more susceptible to pests.