1. Hemiptera: Adelgidae tsugae Annad

2. Life Cycle

4. Prospect Hill, Harvard Forest
Quercus rubra (Northern Red Oak),
Acer rubrum (Red Maple),
Betula lenta (Sweet Birch),
Betula papyrifera (Paper Birch),
Fraxinus americana (White Ash)
Pinus strobus (Eastern White Pine)
Tsuga canadensis (Eastern Hemlock)

7. Prospect Hill, Harvard Forest
Characteristic
Hemlock
Deciduous
Watershed area (ha) 24 27
Riparian hemlock (%) 88 36
Mean summer temperature (°C)
10.8
11.2 pH
5.2
5.4
Dissolved organic carbon (mg/L)
1.4
1.5
Nitrate (mg/L)
0.018
0.019
Phosphate (􀂗g/L)
0.9
1.0
PAR (􀂗mol m-2 s-1) 22 64