ForWarn identified potential disturbances in the Flathead and Lolo National Forests as well as some in the Lewis and Clark National Forest of Montana. Detection in August 2015 observed intensification of potential western spruce budworm damage causing departure of vegetation greenness.
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.
ForWarn found a decline in greenness in the 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 in vegetation by the gypsy moth may indicate the start of a population outbreak for the species.
ForWarn potentially identified a possible insect outbreak in Rio Grande National Forest, Colorado in August 2015. The unknown insect species has caused a decline in vegetation greenness in the area.
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.
ForWarn has identified a defoliation event in northeastern Pennsylvania in July 2015. Based on historical data from 2008 and 2014, the behavior mapped out for this event is similar to Gypsy moth defoliation. The defoliation caused by the moth has been migrating across years.
ForWarn detected a disturbance in the Rio Grande National Forest of southern Colorado in July 2015. The spruce-fir zone of the forest was the most affected; the vegetation greenness departure cause is unknown with a possibility of insect outbreak.
The Pandora Moth (Coloradia pandora) is a native defoliator of ponderosa, Jeffrey and lodgepole pine trees of the Western US. During most years, populations and defoliation is minor, but periodic outbreaks cause widespread defoliation (Speer and others 2001). The outbreak shown here in Arizona's Kaibab National Forest first caused significant defoliation in June-July of 2013 and defoliating caterpillars have now returned in 2015.
ForWarn observed an anomaly in the Plumas National Forest, California. The mixed conifer forest/woodland has had a prior fire west of the area which could account for vegetation departure. However, the fire sawfly has historically been active in the area and may also account for defoliation.
ForWarn detected departure of vegetation greenness in San Juan National Forest, Colorado including parts of the Weminuche Wilderness. Higher elevations below the treeline are noticing departure because of intensifying snow toward open canopies. It is also a possibility that western spruce budworm and spruce beetle are contributing to departure considering historical data on insect infestation in the area in July.