Answer: I think the best approach is to target the insects you have identified - aphids and worms - rather than use a broad-spectrum insecticide, which might kill beneficial insects such as bees and wasps. Aphids can be controlled with applications of Insecticidal Soap. This product targets soft-bodied insects such as aphids but doesn't harm beneficials. Bt works well against caterpillars. It acts as a stomach poison so the pests will need to consume it before they die. Best wishes with your Stephanotis!
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