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10. Simple Techniques for Distributing Aphthona Flea Beetles from Established Field Insectary Sites.  Rich Hansen, USDA-APHIS-PPQ, Forestry Sciences Lab, Montana State University, Bozeman, MT 59717-0278

Once the population of Aphthona spp. adults has exceeded a predetermined threshold, beetles may be collected and distributed to other leafy spurge-infested areas. Adult beetles are simply collected from the field insectary site using a standard sweep net. Four methods for "processing" the collected adults are described, in increasing order of relative sophistication: 1) the "sweep and dump" method; 2) the "sweep, scoop, and dump" method; 3) use of the "Wyoming sorter;" and 4) the use of vacuum sorting. The first three methods are quick and require simple equipment, but may incorporate large numbers of nontarget insects in the collected material. Generally, they provide only crude estimates of the number of Aphthona sp. adults harvested. Vacuum sorting provides generally contaminant-free material and precise quantification, but is more equipment- and time-intensive. The first three processing techniques are appropriate for within-site, within-county, and generally, within-state distribution. Vacuum sampling should be used for inter-state movement of flea beetle adults, or for distribution to "environmentally-sensitive" areas.

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