Summary: Invasive species--harmful, nonnative plants, animals, and microorganisms--are widespread throughout the United States, causing billions of dollars of damage annually to crops, rangelands, and waterways. An important part of pest control is quick action to eradicate or contain a potentially damaging invasive species. Federal rapid response to invasive species varies: species that threaten agricultural crops or livestock are far more likely to elicit a rapid response than those primarily affecting forestry or other natural areas, including rangelands and water areas. A major obstacle to rapid response is the lack of a national system to address invasive species. Other obstacles to rapid response include the need for additional detection systems to identify new species; improved partnerships among federal, state, and local agencies; and better technologies to eradicate invasive species. The Invasive Species Council's Management Plan makes several recommendations for improving rapid response, including developing a program of coordinated rapid response and pursuing increases in discretionary spending to support the program. A concerted effort to improve the rapid response is clearly needed. If properly implemented, the Council's recommendations will go a long way toward developing a national system to address this pressing need.