Most Common Hawthorn Plant Pests:
Identification and Treatment Guide

Hawthorn plants are a popular choice for gardeners due to their beautiful flowers and attractive berries. However, like any other plant, hawthorns are susceptible to various pests that can damage their foliage, flowers, and fruits. In this article, we will discuss the most common hawthorn plant pests, how to identify them, and the best methods for treatment.

1. Hawthorn Leafminer (Profenusa canadensis)

The hawthorn leafminer is a small fly whose larvae feed on the leaves of hawthorn plants. These pests create serpentine mines on the leaves, which can cause them to turn brown and drop prematurely. You can identify the presence of hawthorn leafminers by the distinctive trails they leave on the leaves.

To control hawthorn leafminers, it is important to remove and destroy any infested leaves during the fall or winter months when the larvae are dormant. Applying insecticides can also help prevent future infestations.

2. Hawthorn Lace Bug (Corythucha cydoniae)

The hawthorn lace bug is a common pest that feeds on the undersides of hawthorn leaves. These insects suck sap from the leaves, causing them to turn yellow or brown and develop a stippled appearance. If left untreated, lace bug infestations can weaken the plant and reduce its overall vigor.

To control hawthorn lace bugs, regular monitoring is essential. Look for signs of stippling or discoloration on the undersides of leaves. If an infestation is detected, you can use insecticidal soaps or oils to kill the pests. Pruning any heavily infested branches can also help reduce their population.

3. Hawthorn Spider Mite (Tetranychus spp.)

Hawthorn spider mites are tiny pests that are barely visible to the naked eye. These sap-sucking insects feed on the undersides of leaves, causing them to turn yellow, dry out, and eventually drop. A heavy infestation can lead to defoliation and weaken the hawthorn plant.

To control hawthorn spider mites, regular inspection of the undersides of leaves is crucial. If an infestation is detected, you can use insecticidal soaps or horticultural oils to smother and kill the pests. Increasing humidity around the plant by misting it with water can also help control spider mite populations.

4. Hawthorn Sawfly (Caliroa cerasi)

Hawthorn sawflies are small, black insects with yellow stripes that resemble wasps. The larvae of these pests have a greenish color and feed on the leaves of hawthorn plants, skeletonizing them in the process. Heavy infestations can cause significant damage to the foliage.

To control hawthorn sawflies, handpicking and destroying the larvae can be an effective method. If the infestation is severe, applying insecticides may be necessary. Encouraging natural predators like birds and beneficial insects can also help keep sawfly populations in check.

5. Hawthorn Fruit Fly (Rhagoletis spp.)

The hawthorn fruit fly is a common pest that affects hawthorn fruits. The female flies lay their eggs in developing fruits, and the larvae feed on the flesh, causing it to rot and drop prematurely. Infested fruits often have discolored patches or small exit holes where the larvae emerge.

Controlling hawthorn fruit flies involves monitoring the fruits closely for signs of infestation. Removing and destroying any affected fruits can help prevent further spread of these pests. Insecticidal sprays can also be used to kill the adult flies before they lay their eggs.

Conclusion

Identifying and treating common pests that affect hawthorn plants is essential for maintaining their health and beauty. Regular monitoring, timely intervention, and the use of appropriate insecticides can help control infestations and protect your hawthorns from damage. By staying vigilant and taking proactive measures, you can ensure that your hawthorn plants thrive and continue to be a stunning addition to your garden.