Content tagged "forest ecosystems"

Tree Biology

Climate, Forests and Woodlands Updated: April 10, 2012

Tree physiology functions much as it does in all other plants: Their leaves absorb carbon-dioxide (CO2) from the atmosphere through little pores in their...

Beech Bark Disease

Beech bark disease (Fig. 1) is caused by a complex of two agents, the beech scale insect, Cryptococcus fagisuga (Fig. 2), and a fungus, Nectria coccinea...

Southern Pine Beetle

Climate, Forests and Woodlands Updated: June 29, 2011

The adult southern pine beetle (SPB) is 2 to 4 millimeters in length, has a rounded abdomen, and is brownish-black in color (Figure 1). Males have a frontal...

Oriental Bittersweet-Celastrus orbiculatus

Oriental bittersweet is a deciduous, climbing, woody vine that can grow to lengths of 60 ft (Miller 2003). The alternate, elliptical leaves are light green...

Emerald Ash Borer

Emerald ash borer, Agrilus planipennis, is a newly introduced species (found in 2002) from Asia. Populations have been found in Michigan, Ohio, Illinois,...

Understanding Decomposition and Its Controls

Climate, Forests and Woodlands Updated: June 13, 2011

Decomposition is the breakdown of dead organic material into smaller particles, which helps release nutrients and carbon for plant and microbial production. ...

Dynamics of Nutrient Cycling, cont.

Climate, Forests and Woodlands Updated: June 13, 2011

Soil fertility can be maintained when nutrients are efficiently recycled through the soil food web and soil-plant-animal system. Nutrient cycling is...

Dogwood Anthracnose

Dogwood anthracnose is a relatively new disease to North America. It was first observed in 1976 affecting a population of Cornus nuttallii in Washington...

Balsam Woolly Adelgid in Fraser Fir

The balsam woolly adelgid (Adelges piceae), a native of Europe, was first located in the southern Appalachians in 1957 on Mount Mitchell, North Carolina...

Chestnut Blight

Chestnut blight (Cryphonectria parasitica) has probably had the most pervasive influence on forest structure and composition in the southern Appalachians of...

Asian Longhorned Beetle

Asian longhorned beetle, Anoplophora glabripennis, is a recently introduced pest from China. It is believed to have entered the United States inside solid...

History of Southern Pine Beetle

Climate, Forests and Woodlands Updated: March 14, 2011

The southern pine beetle (Dendroctonus frontalis Zimmermann) is a serious pest of pines in the southern United States, Mexico, and Central America. The...

Soils and Water Availability

Climate, Forests and Woodlands Updated: March 09, 2011

Soil water availability is the capacity of a soil to hold water that is available for plant use. A soil is simply a porous medium consisting of minerals,...

Managed Forests

Climate, Forests and Woodlands Updated: March 04, 2011

Managed forests are those that people intentionally designate and manipulate to produce desired goods such as wood products and/or services such as...

Purple Loosestrife-Lythrum salicaria

Purple Loosestrife is a tall, perennial forb that can grow up to 10 feet in height. It is easily distinguished by the abundant, showy spikes of purple...

Kudzu-Pueraria montana (Lour.) Merr.

Kudzu is a climbing deciduous vine capable of reach lengths of over 100 feet. The stems can grow to 4 inches in diameter and the large semi-woody roots can...

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This work is supported by the USDA National Institute of Food and Agriculture, New Technologies for Ag Extension project.