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Go to:85. Evaluation of Silvicultural Treatments to Minimize Gypsy Moth Impact (WVU Study)

Go to:87. Effects of Defoliation by Gypsy Moth on Stump Sprouting of Mixed Oak Stands

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Catalog of Long Term Research Conducted by the Northeastern Research Station

Catalog #86

Central Pennsylvania Risk-Rating Plots
Initially used for short term impacts of gypsy moth on forest and to refine hazard rating systems developed by Herrick and Gansner. Note: plots were subsetted in 1986 - subset was used to monitor long-term impacts and stand recovery.
Plots monitored during 1978 to 1986 were located across Central PA. roughly between State College, Lewisburg, Harrisburg, and Lewistown PA. UTMs available for location. Plots monitored during 1986 to 1993 were also located in Central PA. within the boundaries of Tuscarora and Bald Eagle State Forests. This area is part of the Ridge and Valley physiographic province and includes primarily mixed oak forests including some of the most extensive and highest quality oak forests in PA. Gypsy moth defoliation patterns were found over the plots from 1978 to 1990 with a gypsy moth outbreak occurring during 1981 and 1986. The stand age ranged from 33 to 161 years during 1978. The 1978 basal area/acre of all species in 1978 ranged from 29 to 184' squared/acre with distribution of oak basal area/acre ranging from 0% to 97%.
During 1978, 201 plots within 3 permanent 0.1-acre plots were randomly selected within 4 susceptible strata. In 1986, monitoring began on 228 plots in a six-county area of central PA and within the boundaries of the Tuscarora and Bald Eagle State Forests. All of subset sites are relocatable.
None; however, subset is being salvaged and no longer protected from spray for gypsy moth defoliation; and, there are no gypsy moth impacts to measure.
Plots subsetted in 1986 to monitor long-term impacts and stand recovery.
All trees > 3.0" d.b.h. on each 0.1-acre plot were tallied: 1978.
Tree sp., d.b.h., merchantable height, butt log grade, basal area, crown condition (vigor), slope, slope position, aspect, stand age, site index, tree dominance, elevation, % defoliation, mortality, land capability class, starch content (subset): All variables were measured annually on all plots during midsummer 1978 to 1985 except plot-level defoliation in 1985 which was estimated from subsamples; Vigor and defoliation were measured annually on subsetted plots during 1986 to 1993. Ingrowth was an added variable and d.b.h. was measured in 1990 and 1995.
Regeneration surveys to evaluate understory condition in response to overstory mortality: 1989 to 1993 and in 1995.
Initially field data collection rechecked intensely; data was verified the second year. Subset has been verified by 100% cross reference with field sheets. Accuracy assessment completed 1986-1992 for subset. Annual field training for all field crew.
Raw and Summarized including subset raw, summarized & analyzed on 9-track tape in fireproof safe. FoxPro & SAS used to analyze data.
Studies of Ecosystem Processes 
Mechanistic Studies 
Model Development and Application
Feicht, D.L; Fosbroke, S.L.C.; Twery, M.J. 1993. Forest stand conditions after 13 years of Gypsy Moth infestation. In: Gillespie, A.; Parker, G.; Pope, P.E.; Rink, G., eds. Proceedings, 9th central hardwood forest conference; 1993 March 8-10; West Lafayette, IN., Purdue University: Gen. Tech. Rep. NC-161. St. Paul, MN.: U.S. Department of Agriculture, Forest Service, North Central Forest Experiment Station. 130-143 p.

Gansner and Herrick have publications on the data for 1978-1985.

Kurt Gottschalk / Rose-Marie Muzika, USDA Forest Service, 180 Canfield St., Morgantown WV 26505-3101. (304) 285-1598
Pennsylvania Bureau of Forestry 
USDA Forest Service, Northeastern Area State and Private Forestry



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