1. Formerly statistician at USDA GIPSA Technical Services Division, 10383 N. Ambassador Dr., Kansas City, MO 64153, U.S.A..
2. Syngenta Biotechnology Inc., 3054 E. Cornwallis Rd., Research Triangle Park, NC 27709, U.S.A.Tel: +1.919.226.7446.
3. Corresponding author. Bayer CropScience LP, 2 T.W. Alexander Dr., Research Triangle Park, NC 27709, U.S.A.Tel: +1.919.549.5684.