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Alligator Weed - Alternanthera philoxeroides
Family: Amaranthaceae

View Video
Status: Invasive. Biocontrol efforts are in practice.

Location info:

This plant has been documented from Mississippi area. It a fairly common emergent plant species in the South and can be found easily in drainage ditches and lake edges.

Info:

Alligator weed provides us with a good example of an invasive weed that has been succesfully managed through biological control programs. Take these numbers for instance. There were 97,000 problem acres of alligatorweed in the US in 1963; by 1981 there were less than 1,000 problem acres. Why did this happen? It was mostly the work of the following three biocontrol insects (introduced in that order).

Biocontrol insects:

  1. Alligatorweed flea beetle (Agasicles hygrophila)
  2. Alligatorweed thrips (Amynothrips andersoni)
  3. Alligatorweed stem borer (Vogtia malloi) - as shown in the video.

VIDEO

Website, video, and graphics by Rob Nelson
For more information on this plant or management please contact US Army Corp of Engineers

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