Aphids of hibiscus

Disease Information

Aphids

Symptoms

You will usually see aphids on hibiscus close to the tops of the stems. Often they congregate on and around the flower buds. Besides being large enough to spot easily, they also excrete a substance called "honeydew" that is clear and sticky. This drops onto the top of the leaf below where they are feeding and very quickly a type of mold called "black sooty mold" grows in the honeydew. The black color stands out on hibiscus leaves and its presence tells you that a sap-sucking insect such as aphids is feeding on the plant. (There are other sap suckers such as white flies that excrete honeydew, but aphids are the most common.)

Comments

Aphids have several natural enemies that feed on them, and if these are present in large enough numbers,

Management

Due to this very efficient way of reproducing, aphids need to be controlled when they are first seen on your hibiscus. The very best way to do this is to treat the plants with a systemic pesticide that enters the hibiscus through the roots, and is then circulated within the phloem vessels of the plant for several months. When an aphid pierces the phloem vessel and feeds on the sap inside, it also ingests the pesticide and dies.

We offer two products that control aphids. The easiest to apply and longest lasting is Bayer Tree & Shrub. This is sprinkled on the soil then watered in, and lasts 3 months. We also have Bayer Advanced 3-in-1, a spray pesticide that needs to be repeated every 2-3 weeks if aphids are active and present. For this reason, in our own use at HVH, we find the systemic product, Bayer Tree & Shrub to be by far the easiest and most effective pest control product to control aphids.

 



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