Delta Journal
by Bob Thomas

Caterpillars are supposed to be cute little innocuous worms that while away their days munching leaves. Indeed, most are - but some aren’t. A select few pack a walloping surprise for the unsuspecting gardener who touches or rubs against them. Some, like the Tentacled Prominent, exude a creamy fluid that causes a rash. Others have hollow urticating spines connected to venom sacs that cause symptoms ranging from mild pain to anaphylactic shock! Two of the most common in Louisiana are the Saddleback and Pus caterpillars.

The inch long Saddleback resembles a little Mardi Gras float with its green and rich brown markings and the arrangement of its spines. They are so cute that people find them irresistible to touch. The Pus Caterpillar is slightly larger than the Saddleback, is reddish-tan, and looks like it is composed only of coarse hairs neatly combed backward into a dorsal crest. No eyes or legs are visible. When this species is especially abundant, another problem may occur. As they prepare their cocoons for pupation, the hairs may drift away in the air and, if aspirated, cause allergic reactions in sensitive people.

Envenomation by caterpillar hairs is called erucism, or para-erucism if by secreted fluids. First aid includes removing spines by lightly applying and removing transparent tape, followed by thoroughly washing the affected area. But remember, severe reactions may occur so it is best to consult a physician!

Also published in Delta Journal, The Times Picayune, September 20, 1989.