Brown scale

The brown scale (Eulecanium tiliae) is a member of the Coccidae family within the order Hemiptera. This sap-sucking insect is a common and destructive pest, frequently infesting ornamental trees, fruit orchards, and urban park landscapes.

This pest affects a wide range of host plants, including linden, maple, hawthorn, as well as various fruit trees such as apple, pear, plum, and cherry. Severe infestations often lead to reduced vigor, stunted growth, and in extreme cases, the mortality of young plants.

The life cycle of the brown scale involves a single generation per year. They overwinter as second-instar nymphs sheltered in bark crevices. As temperatures rise in spring, they migrate to young twigs to feed. By early summer, the females develop a characteristic dark brown, globular scale that protects the eggs laid beneath it.

The primary damage is caused by the extraction of large amounts of plant sap. Additionally, the insects secrete honeydew, which serves as a substrate for sooty mold fungus. This mold covers leaves, significantly reducing photosynthetic capacity, leading to premature leaf drop and weakening the plant's overall resistance.

Successful management requires an integrated approach. Cultural controls include pruning and removing heavily infested branches to reduce pest density. During the growing season, systemic insecticides are highly effective. Furthermore, applying horticultural oil sprays in early spring helps to eliminate overwintering nymphs before they become active.