Hibiscus Pest vs. Disease: Distinguishing Aphids from Leaf Spot

Diagnosing Black Spots on New Hibiscus

A Southern California gardener can't control black spots/bugs on hibiscus tips with insecticidal soap and rose sprays every other day.

Aphids – Should respond to sprays; try carbaryl or Ortho general insecticide if persistent
Leaf spot disease – Black spots from fungus; unsprayable once visible. Fertilize well, schedule fungicide for early next year

Accurate identification determines treatment approach.

Shrubs: Evergreen Bush Cottony Aphids: Systemic Insecticide; Aphids on Hibiscus with Kids: Insecticidal Soap Is the Safest Control; Aphids on Evergreens: Garlic, Soap, and Lady Beetle Allies; Hibiscus Buds Cut Off: Cutworms or Slugs; Mystery Insects on Indoor Hibiscus: Likely Ladybug Larvae, Not Pests; Brown Spots on Sarracenia 'Judith Hindle': Normal Pitcher Aging from Heavy Feeding; Basil Dark Spots and Missing Leaf Edges: Likely Overwatering, Not Bugs; Eliminating Fungus Gnats on Indoor Hibiscus: Repotting and Insecticidal Soap; Eliminating Hibiscus Pests Brought Indoors: Soil Sterilization Required; Controlling Aphids and Hornworms on Jalapeños: Safe Soap and BT

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