ForWarn II

Satellite-Based Change Recognition and Tracking

Insects

Defoliation in NC's Roanoke River Bottomland Forests

Thu, 05/19/2016 - 18:19 -- stevenorman
Forest Tent Caterpillar defoliation along Conoho Creek

The Forest Tent Caterpillar (Malacosoma disstria) is a widespread native defoliator of deciduous forests in the Eastern US. While host trees differ regionally, the insect prefers sweet gum (Liquidambar styraciflua), tupelo gum, black gum (Nyssa spp.) and species of oak (Quercus spp.) in the bottomland forests of North Carolina's Coastal Plain.

The larvae hatch in early spring as the tree buds swell, then larvae defoliate emerging and growing leaves in April and early May. After a few weeks, caterpillars form pupae, then adults emerge in late May.

Western Spruce Budworm Outbreak in Targhee and Caribou National Forests, ID

Mon, 08/24/2015 - 07:03 -- wchristie

ForWarn has detected apparent decline in vegetation greenness in August 2015. The data shows characteristics of western spruce budworm population outbreak, which lasts about 10-15 years. The species is known to be a defoliator of coniferous forests and is affecting the amount of foliage in Targhee and Caribou National Forest, Idaho.

Gyspy Moth in George Washington National Forest, VA and Monongahela National Forest, WV

Tue, 08/04/2015 - 06:40 -- wchristie

ForWarn found a decline in greenness in the George Washington National Forest of Virginia and Monongahela National Forest of West Virginia in August 2015. Gypsy moth is a historical defoliator of these areas, their damage covering one million acres in 2015. The large decline by the gypsy moth may indicate the start of a population outbreak for the species.

Douglas-fir Tussock Moth East of Pikes Peak, CO

Fri, 07/31/2015 - 11:14 -- wchristie

ForWarn recognized a decline in vegetation greenness east of Pikes Peak and west of Colorado Springs, Colorado on July 31, 2015. The mixed conifer forest of this area is showing only a portion of the canopy species being affected, most substantially the Douglas fir. The Douglas-fir tussock moth is a likely candidate for the defoliation of firs in the area. At higher elevations, western spruce budworm affecting lodgepole pine, ponderosa pine, and mixed conifers at 9000 ft.

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