Southern flannel moth

The Southern flannel moth (Megalopyge opercularis), also known as the puss caterpillar, belongs to the order Lepidoptera and the family Megalopygidae. This species is recognized globally as a significant pest of landscape and ornamental trees, as well as a hazard to humans due to its potent stinging hairs.

This pest affects a wide variety of woody plants, including oaks, elms, citrus trees, roses, and various shade trees. The caterpillars are highly voracious, feeding on the leaves of host plants. Heavy infestations can lead to significant defoliation, which hampers the plant's ability to undergo photosynthesis and reduces its overall vigor.

The life cycle of this moth is typical for Lepidoptera, progressing through egg, larva, pupa, and adult stages. Females lay eggs on leaves, which hatch into caterpillars that grow through several instars. The caterpillars are covered in thick, furry-looking setae, which conceal venomous spines capable of delivering a very painful sting upon contact.

The damage caused is twofold: biological impact on plant growth and the physical danger to anyone maintaining the garden. When the larvae feed, they consume large portions of foliage. The venomous nature of the caterpillars means that garden maintenance near infested trees can result in severe dermatitis, swelling, and systemic reactions in humans.

Effective management and control measures should focus on the following:

• Regular inspection of host trees during the growing season.
• Manual removal of caterpillars using heavy-duty gloves and long tools.
• Application of approved insecticides for caterpillar control when larvae are in early instars.
• Biological control through the encouragement of natural predators such as parasitic wasps.