Answer: I've had great success with insecticidal soap in controlling aphids. It's made from fatty acids of certain plants, which makes it relatively safe for people, plants, and beneficials such as ladybugs. Since aphids can multiply at an alarming rate, you'll need to inspect your plants on a daily basis and spray as needed. Eventually you'll control the pests. Spider mites like dry, dusty places. The best way to deter them is to hose your plants off with plain water every few days. As for the leaves that are yellowing and developing black spots, pinch them off the plant and remove them from the garden. If you make it part of your daily routine to pinch off affected leaves, spray aphids with insecticidal soap and hose the plants off every few days, I think you'll find your hibiscus plants respond with lots of healthy growth and beautiful flowers.
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