Orange ladybird

Systematic position: The orange ladybird (Halyzia sedecimguttata) belongs to the order Coleoptera and the family Coccinellidae. Unlike many other members of this family, which are famous predators of aphids and scale insects, this specific species is a mycophagous insect, meaning it feeds on fungi.

Biology and life cycle: The adult beetle is bright orange with 16 white spots. Its life cycle consists of egg, larva, pupa, and adult stages. They overwinter as adults in leaf litter or crevices in bark. When spring temperatures rise, they emerge to seek out their primary food source: powdery mildew and other surface-growing fungi.

Nature of damage and harmfulness: The harmfulness of the orange ladybird is indirect but significant. While they do not consume plant tissues directly, they act as vectors for fungal diseases. By crawling over leaves infected with powdery mildew and then moving to healthy plants, they effectively facilitate the spread of fungal infections throughout the garden.

Host plants: This insect is commonly found on broad-leaved trees such as lime, maple, birch, and various fruit-bearing shrubs. They aggregate in areas where fungal growth is prevalent, making ornamental plants and fruit trees in shaded or humid gardens their preferred habitats.

Control measures: Effective management focuses on reducing the presence of the fungi that sustain the population:

• implementing strict garden sanitation by removing infected leaf debris;
• pruning trees and shrubs to improve air circulation and reduce humidity;
• applying appropriate fungicides to eliminate the fungal mats that the beetles feed on;
• monitoring plant health to prevent the initial development of powdery mildew, which attracts the beetles.