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BIOLOGICAL CONTROL INVASIVE WEEDS • THERE ARE NUMEROUS SPECIES OF ALIEN PLANTS THAT HAVE INVADED NORTH AMERICA AND ARE NOW IMPORTANT WEEDS IN AGRICULTURE AND ELSEWHERE. • THEY HAVE ESCAPED THEIR ENEMIES AND HAVE EXPLODED IN NUMBERS IN THEIR NEW HOMES IMPORTANT INVASIVE WEEDS IN THE UPPER MIDWEST • • • • • GARLIC MUSTARD CANADIAN THISTLE SPOTTED KNAPWEED JAPANESE HONEYSUCKLE EUROPEAN MILFOIL GARLIC-MUSTARD (ALLIARIA PETIOLATA) SPOTTED KNAPWEED (CENTAUREA MACULOSA) EFFORTS IN BIOLOGICAL CONTROL