Invasive Tree Species

These courses represent key species which pose a significant threat to natural resources. Completing these training courses will provide you with the knowledge to identify and report these important threats.

Black Alder

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Black Alder

Deciduous, medium-size tree that is a member of the Birch (Betulaceae) family. Capable of displacing native vegetation and nitrogen fixation. It has been planted on highly disturbed or infertile sites and for windbreaks.

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Black Locust

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Black Locust

Deciduous, medium-size tree that is a member of the Pea (Fabaceae) family. The nitrogen fixing capacity of this species may alter soil chemistry and subsequent nutrient cycling of forest systems.

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Callery Pear

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Callery Pear

Deciduous tree that is a member of the Rose (Rosaceae) family. It was introduced to North America as an ornamental.

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Norway Maple

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Norway Maple

Medium sized, perennial tree that is a member of the Maple (Aceraceae) family. It can create dense shade, monopolizes soil moisture, regenerates prolifically under its own canopy, and reduces overall plant diversity on a site.

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Tree Of Heaven

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Tree Of Heaven

Deciduous small to large tree that is a member of the Quassia (Simaroubaceae) family. It is capable of extensive cloning and has allelopathic properties. Introduced as an ornamental because it grew quickly and was considered very attractive. 

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