Furry caterpillars sporting orange and white hues thrived in the Humber Valley area of Newfoundland during the summer months. These caterpillars feasted on various tree species, leaving brown patches scattered across the landscape.
The white tussock moth caterpillars were in abundance, found on patios and dropping from trees all around. Local resident Mark Grady from Corner Brook remarked on their widespread presence, noting they were visible in trees and bushes alike.
Research scientist Joe Bowden from the Atlantic Forestry Centre explained that while the species is native to the region, the surge in their population this summer could be attributed to climate change and the hot, dry weather conditions. Bowden highlighted the early emergence and spatial redistribution of species as potential effects of these environmental changes.
Bowden reported tree damage in multiple areas including White Bay, Green Bay, Corner Brook, St. Albans, Conne River, and along the Bay d’Espoir Highway. He emphasized that this disturbance was localized and did not impact other parts of Canada.
As August progressed, the caterpillars completed their feeding phase, with male white tussock moths now seen flying in the Corner Brook vicinity. The female moths, while wingless, pupate and lay eggs in cocoons, remaining there throughout the winter months. These cocoons, sticky and white, can be found on various surfaces such as homes and decks.
Bowden predicted that the high moth population levels would likely persist for multiple years, noting that dense populations are prone to rapid disease transmission. This could potentially lead to population reductions within three to five years.
Overall, the impact of these caterpillars on foliage in western and central Newfoundland serves as a reminder of the intricate ecological interactions influenced by changing environmental conditions.