August 1996
DESCRIPTION: Hagmoth larvae are extremely bizarre in appearance. They are covered with short, dark brown hairs and have nine pairs of fleshy appendages, some of which are long and twisted. Rose, sassafras, alder, and spirea are among their favorite hosts.
HABITAT: The Hagmoth is a general feeder and is commonly encountered on shade trees and ornamental shrubs. They are found in late summer.
TYPE OF DAMAGE: The poisonous hairs or spines are hollow and connected to underlying poison glands. Contact with them causes a burning sensation and inflammation that can be as painful as a bee sting. The irritation can last for a day or two and may be accompanied by nausea during the first few hours. The site of contact reddens and swells much like a bee sting.
CONTROL: A person "stung" by a poisonous caterpillar should immediately wash the affected area to remove any insect hairs and poison that remain. An ice pack will help reduce swelling, and creams and lotions containing steroids will lessen the discomfort and promote healing. Persons known to be sensitive to insect stings should consult a physician. Stinging caterpillars rarely occur in sufficient numbers to be considered plant pests, but people who work with ornamental plants should learn to recognize them and avoid touching them.