Hibiscus buds fall off instead of opening
Aphids reproduce rapidly, and new generations can quickly become resistant to chemical pesticides such as Malathion. You can try rotating pesticides and including a pyrethrin in the rotation. You might also consider abandoning the pesticides all together and introducing beneficial insects like ladybugs. Hibiscus plants do best when kept evenly moist; even a short dry spell can cause bud drop. Keep the soil evenly moist and mulch them to maintain soil moisture during the hot summer weather.
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