Hawthorn leaf beetle

The Hawthorn leaf beetle (Lochmaea crataegi) is a member of the Chrysomelidae family within the order Coleoptera. This insect is a specialist herbivore that primarily targets plants belonging to the Rosaceae family, making it a significant concern for orchardists and gardeners.

This pest infests a wide range of fruit and ornamental trees, including hawthorn, apple, pear, plum, cherry, and rowan. Both the adult beetles and the larvae are active feeders, causing extensive damage to the foliage during the growing season.

The life cycle of Lochmaea crataegi involves a period of dormancy during winter, which the adult beetles spend in leaf litter or the top layer of soil under host plants. In the spring, they emerge, feed on buds and young leaves, and subsequently lay clusters of eggs on the underside of foliage.

The feeding damage is characterized by skeletonization, where the leaf tissue is consumed while the larger veins remain intact. Severe infestations can cause total defoliation, which severely stresses the tree, inhibits fruit development, and reduces the plant's overall vigor for the following season.

Effective management strategies combine cultural and chemical practices to minimize damage:

• Sanitation by removing leaf litter and debris beneath trees in late autumn to reduce overwintering sites.
• Tillage of the soil in the root zone to disrupt the development of pupae.
• Application of targeted insecticides during the larval stage if the infestation density warrants chemical intervention.