Sticky Leaves on Jasmine: Identifying and Treating Scale and Mealybug Infestations

The Sticky Substance Is Honeydew

Sticky residue on Jasmine (and nearby surfaces) is honeydew excreted by sap-sucking insects—most likely scale or mealybugs. Mealybugs look like tiny white cotton bits; scale appear as small, oval, translucent bumps (young) or hard brown shells (mature) on stems and leaf undersides.

Treatment Strategy: Complete Coverage Is Essential

Because these pests hide in crevices, any treatment must coat every leaf and stem surface to the drip point. Repeat in 5–7 days to catch hatchlings.

Recommended Non-Toxic Options

• Brand X Foliage Cleaner (silicon-based, penetrates well). Source: Southwest Plantscape Products, 1-800-333-7977.
• Alcohol spray: 1 part rubbing alcohol : 5 parts water + dash of liquid soap.
• Horticultural oil (e.g., Sun Spray Ultra Fine) – smothers pests.
• Hot Pepper Wax – capsaicin repels/kills.
• Neem oil – dilute with water and a little Pine Sol to mask odor.

Application Rules

• Never spray in direct sun or above 75°F.
• Test on a few leaves first; wait 48 hours for adverse reaction.
• Cover all surfaces, especially leaf undersides and stem joints.

Prevention

Inspect new plants, maintain good air circulation, and avoid over-fertilizing (which encourages tender growth that pests love).