Crown Condition of Trees in Virginia- 1998

Data adapted from Forest Health Monitoring Program Fact Sheets
http://www.na.fs.fed.us/spfo/fhm/fhh/fhmusamap.htm

 

Selected Tree Species
Crown Dieback
Crown Density
Percent of trees in poor crown condition
Eastern White Pine
Loblolly Pine
Virginia Pine
Black Locust
Hickories
Oaks, Red
Oaks, White
Red Maple
Sweetgum
yellow-poplar

2.8
0.0
2.1
0.0
1.4
3.3
1.9
1.8
1.5
1.5

8.3
2.5
4.3
0.0
1.4
0.6
2.8
0.6
3.1
0.0

25.0
10.5
36.2
50.0
6.8
6.6
5.4
5.4
3.1
4.4

           

Both the red and white oak group ranked high in the proportion of trees in the poor crown dieback. This may be partially as a result of gypsy moth defoliation in the early 1990's, which stressed the trees and is manifested in crown dieback. One-half of the black locusts had a poor crown condition, based on foliage transparency classes. Foliage transparency is a measure of defoliation and this condition is most likely due to the presence of locust leaf miner. Red maple and yellow-poplar generally had the overall best crown conditions.

 

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