Sticky Houseplant Leaves: Identifying and Treating Scale Insects

Sticky residue on houseplant leaves isn't sap—it's honeydew excreted by scale insects. These tiny, armored pests suck plant juices and weaken growth if uncontrolled.

Identifying Scale

Check leaf undersides and stems for tan/brown/black bumps resembling tiny seashells. These are the insects' protective shells—impervious to insecticidal soap.

Treatment Options

• Suffocation: Horticultural oil or insecticidal soap blocks breathing pores. Repeat every 2 weeks.
• Dissolve armor: 2 tsp dish detergent/gallon water applied with cloth/swab, then rinse. Or rubbing alcohol on swab. Wipe away scales gently.
• Heavy infestations: Follow with regular insecticidal soap sprays.

Cover soil with plastic before treatment to prevent scales falling into soil and reinfesting.

Cleanup

Remove heavily infested leaves. Wipe remaining sticky residue with warm damp cloth. Clean affected furniture similarly.