SANTA FE, N.M. — An outbreak of Douglas-fir tussock moth caterpillars has taken hold at Hyde Memorial State Park, prompting warnings from state park and health officials. The caterpillars, known for their dense coats of tiny, airborne hairs, are causing both environmental damage and allergic reactions in visitors and pets.
The caterpillars are aggressively defoliating Douglas and White-fir trees, turning needles red before they drop. Some trees have experienced up to 80% defoliation, though officials say many will recover by next spring. The outbreak is part of a broader regional pattern, with similar activity reported in parts of the Carson and Cibola National Forests.
Exposure to the caterpillars or their cocoons can lead to skin irritation, rashes, watery eyes, sneezing, and in some cases, more severe respiratory symptoms like wheezing or chest tightness. Officials urge visitors not to touch the insects or any surfaces where they may have shed hairs.
Two group shelters at the park have been closed through at least mid-August due to heavy caterpillar activity. Cleanup and hazard tree assessments are planned once the outbreak subsides.
Experts say the surge in caterpillar numbers is likely tied to recent moisture levels, which created ideal conditions for the moth’s life cycle. While male moths can fly, females remain stationary, laying eggs that will likely hatch again next summer.
Park officials are reminding visitors that while the campgrounds remain open, caution is advised when hiking or picnicking in affected areas.
