Crinkled flannel moth

The Crinkled flannel moth (Megalopyge crispata) is a member of the order Lepidoptera and the family Megalopygidae. Native to North America, this insect is well-known not only for its impact on vegetation but also for the medical significance of its larvae, which possess stinging hairs capable of causing severe skin irritation.

This pest feeds on a wide range of host plants, including various broad-leaved trees and shrubs. Common hosts include oak, elm, maple, apple, pear, and blackberry. Due to their generalist feeding habits, they can colonize both ornamental gardens and wild forest areas, making their management a common concern for arborists.

The life cycle follows a complete metamorphosis: egg, larva, pupa, and adult. The insect typically produces one generation per year. Females deposit eggs in clusters, covering them with specialized hairs from their abdomen for protection. The overwintering stage usually occurs as a larva or pupa inside a tough, silken cocoon attached to twigs or trunks.

The primary damage is caused by the caterpillars, which are voracious feeders. They consume leaves, often leaving only the main veins intact, which causes significant stress to the host tree. During heavy infestations, the loss of foliage can lead to reduced plant vigor, stunted growth, and increased susceptibility to other pathogens and environmental stresses.

• Perform regular field scouting to detect early instar larvae on foliage.
• Remove and destroy overwintering cocoons during the dormant season.
• Apply biological insecticides based on Bacillus thuringiensis during early larval stages.
• Implement chemical control measures using registered contact insecticides when populations exceed damage thresholds.
• Always wear gloves and long-sleeved clothing when working near infested plants to prevent contact with toxic spines.