National Invasive Species Information Center (NISIC): gateway to invasive species information; covering Federal, State, local, and international sources.

Species Profile -- Citrus Canker
USDA. NAL. National Invasive Species Information Center.
Citrus canker is a bacterial disease that causes lesions on the leave, stems, and fruit of citrus trees. While not harmful to humans, the disease affects the health and marketability of infected fruit. Citrus canker is spread by wind and rain.

Wildland Fire in Ecosystems: Fire and Nonnative Invasive Plants (Sep 2008)
USDA. FS. Rocky Mountain Research Station.
RMRS-GTR-42, vol. 6.
This state-of-knowledge review of information on relationships between wildland fire and nonnative invasive plants can assist fire managers and other land managers concerned with prevention, detection, and eradication or control of nonnative invasive plants.

Species Profile -- Rusty Crayfish
USDA. NAL. National Invasive Species Information Center.
Rusty crayfish are an aggressive species that cause a variety of negative environmental and economic impacts when introduced to new waters. Rusty crayfish often displace native or existing crayfish species and destroy aquatic plant beds.

Don't Move Firewood - Protect the Nations Forests
USDA. FS. Northeastern Area. Forest Health Protection.
Buy and use your firewood locally. Don’t take it with you and don’t bring any back.
Do you want to protect trees? Then, don't move firewood. Moving firewood can spread invasive, tree-killing diseases and insect pests like the Asian longhorned beetle and the Emerald Ash Borer.

Don't Move Firewood

What Campers Need to Know (PDF | 96 KB)
Pennsylvania Department of Conservation and Natural Resources.

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Interactive Learning Module
Why are invasives a problem?