21. USDA-APHIS-PPQ Redistribution of Aphthona spp. Leafy Spurge Flea Beetles, 1988-1993.  H.W. Ziolkowski, R.D. Richard, and R.W. Hansen; USDA-APHIS-PPQ, Forestry Sciences Lab, Montana State Univ., Bozeman, MT 59717-0278.

USDA-APHIS-PPQ began its biological control program on leafy spurge in 1988 with the introduction of three species of Aphthona flea beetles: A. cyparissiae, A. czwalinae, and A. flava. A. nigriscutis was brought into the program in 1989, followed by A. lacertosa and A. abdominalis in 1993. The following redistribution activity by species has occurred from 1988 through 1993:

A. abdominalis (50 adults in one Montana release)

A. cyparissiae (128,553 adults released at 178 sites in 110 counties in two states)

A. czwalinae (749 adults released at seven sites in three counties in two states)

A. flava (174,590 adults released at 131 sites in 77 counties in fifteen states)

A. lacertosa/A. czwalinae mix (25,720 adults released at 21 sites in fifteen counties in eleven states)

A. nigriscutis (336,894 adults released at 389 sites in 149 counties in fourteen states)

The following state have received Aphthona species flea beetles in the period from 1988 to 1993: Colorado, Idaho, Iowa, Minnesota, Montana, Nebraska, Nevada, New Mexico, North Dakota, Oregon, South Dakota, Utah, Washington, Wisconsin, and Wyoming. Thematic maps of the redistribution of Aphthona species leafy spurge flea beetles in these states and tables summarizing the releases by species and state were displayed.