1. S. Aref, and D. R. Pike .1998 .Midwest farmers perceptions of crop pest infestations., Agron. J, 90 :819 –825 .
2. J. Barnes, B. Johnson, K. Gibson, and S. Weller .2004 .Crop rotation and tillage system influence late-season incidence of giant ragweed and horseweed in Indiana soybean., Online. Crop Manage doi:10.1094/CM-2004-0923-02-BR.
3. L. Bourgeois, I. N. Morrison, and D. Kelner .1997 .Field and producer survey of ACCase resistant wild oat in Manitoba., Can. J. Plant Sci, 77 :709 –715 .
4. S. P. Conley, D. E. Stoltenberg, C. M. Boerboom, and L. K. Binning .2003 .Predicting soybean yield loss in giant foxtail (Setaria faberi) and common lambsquarters (Chenopodium album) communities., Weed Sci, 51 :402 –407 .
5. J. E. Creech, and W. G. Johnson .2006 .Survey of broadleaf winter weeds in Indiana production fields infested with soybean cyst nematode (Heterodera glycines)., Weed Technol, 20 :1066 –1075 .