Why Are There Aphids On My Citrus Tree?
Aphids are one of the most common pests found on citrus trees. These tiny insects feed on plant sap and can quickly multiply into large colonies. Homeowners often notice curled leaves, sticky residue on leaves, ants climbing the tree, or distorted new growth before they actually see the aphids themselves.
While a few aphids usually won't kill a healthy citrus tree, large infestations can weaken the tree, reduce fruit production, and create conditions that lead to additional problems. Aphids produce a sticky substance called honeydew that attracts ants and encourages black sooty mold to grow on leaves and branches.
The first place to look for aphids is on new growth. They prefer tender leaves and shoots where the plant sap flows most freely. They may be green, black, yellow, brown, or even pink depending on the species.
Signs of an aphid infestation include:
- Curled leaves
- Distorted new growth
- Sticky leaves
- Large numbers of ants climbing the tree
- Black sooty mold
- Poor growth
- Reduced fruit production
Many people are surprised to discover that the ants are often protecting the aphids. Ants feed on the honeydew produced by aphids and will actually defend them from beneficial insects. Controlling ants is often an important part of controlling aphids.
Natural predators such as ladybugs, lacewings, hoverflies, and parasitic wasps frequently help reduce aphid populations. Avoiding unnecessary pesticide applications can help these beneficial insects do their job.
A strong stream of water from a garden hose can sometimes remove many aphids from a small tree. In larger infestations additional treatments may be necessary.
If your citrus tree is showing signs of aphid damage, an experienced tree professional can help diagnose the problem and recommend the proper course of action.
When Should You Be Concerned?
If large portions of new growth are becoming distorted, leaves are covered with sticky honeydew, or black sooty mold is spreading throughout the canopy, it is a good idea to have the tree evaluated. Aphid populations can grow very quickly under favorable conditions.
Proper watering, fertilization, and pest management can often restore the health and appearance of affected citrus trees.
Warner has been diagnosing sick trees for decades and can help determine whether aphids, disease, nutritional deficiencies, or environmental factors are responsible for the symptoms you are seeing.