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Fig. 3.3 The hemiparasite, Striga asiatica (witchweed), occupied > 160,000ha in North and
South Carolina (USA) by 1970 ( shaded counties in each state). Stringent application of inter-
county quarantine of contaminated farm implements coupled with an effective strategy to eradi-
cate witchweed on infested sites had progressively reduced the invasion to < 1,000 ha by early
2007 (map sources: http://www.lib.ncsu.edu/exhibits/sodfather/images/timeline58.jpg; http://
ceris.purdue.edu/napis/pests/ww/imap/ww03nc.html)
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