Hibiscus Bud Drop with Cottony Webs: Mealybug Infestation

Cottony webbing at bud bases, unopened buds, and crinkled leaves on hibiscus indicate a mealybug infestation—possibly the pink hibiscus mealybug (Maconellicoccus hirsutus), an invasive species.

Mealybug Damage

Mealybugs insert needle-like mouthparts into buds and stems, sucking sap and injecting toxins that prevent bud opening and distort growth. Honeydew and sooty mold follow. Heavy infestations kill branches and eventually the plant.

Identification

• Pinkish bodies covered in white wax
• Cottony egg sacs in leaf axils and bud bases
• Ants tending colonies
• Black sooty mold on leaves below

Control Strategy

1. Prune heavily infested branches—bag and dispose
2. Alcohol swabs for accessible clusters
3. Insecticidal soap or horticultural oil—thorough coverage, repeat weekly
4. Systemic: Imidacloprid soil drench for season-long control
5. Biological: Release Cryptolaemus montrouzieri (mealybug destroyer)

Organic products like neem oil or pyrethrin+soap blends work with persistence. Hibiscus recovers well once pests are controlled. Monitor weekly—mealybugs reproduce rapidly.