Urwin, P. E., C. J. Lilley, M. J. McPherson, and H. J. Atkinson. 1997. Resistance to both cyst and root knot nematodes conferred by transgenic Arabidopsis expressing a modified plant cystatin. Plant J. 12:455-461.

Van der Plank, J. E. 1963. Plant Diseases: Epidemics and Control. New York: Academic Press.

Van Raamsdonk, L. W. D., and H. J. Schouten. 1997. Gene flow and establishment of transgenes in natural plant populations Acta Bot. Nederlandica 46:69-84.

Viscusi, W. K., J. M. Vernon, and J. E. Harrington, Jr. 1995. Economics of Regulation and Antitrust. Cambridge, MA: MIT Press.

Vos, P., G. Simons, T. Jesse, J. Wijbrandi, L. Heinen, R. Hogers, A. Frijters, J. Groenendijk, P. Diergaarde, M. Reijans, J. Fierens–Onstenk, M. deBoth, J. Peleman, T. Liharska, J. Hontelez, and 1998. The tomato Mi-1 gene confers resistance to both root-knot nematodes and potato aphids. Nat. Biotechnol. 16:1365-1369.

Wahl, I., Y. Anikster, J. Manisterski, and A. Segal. 1984. Evolution at the center of origin. Pp. 39-77 in The Cereal Rusts: Origins, Specificity, Structure, and Physiology Vol. I, A. P. Roelfs, and W. R. Bushnell, eds. Orlando, FL: Academic Press.

Waloff, N., and O. W. Richards. 1977. The effect of insect fauna on growth, mortality, and natality of broom, Sarothamnus scoparius. J. Appl. Ecol. 14:787-798.

Walton, J. D. 1996. Host selective toxins: Agents of compatibility. Plant Cell 8:1723-1733.

Wassenaar, L. I., and K. A. Hobson. 1998. Natal origins of migratory monarch butterflies at wintering colonies in Mexico: New isotopic evidence. Proc. Natl. Acad. Sci. U.S.A. 95:15436-15439.

Weiss, R. 1999. Gene-altered corn's impact reassessed. The Washington Post, November 3, page A3.

Weiss, R. 2000. EPA restricts gene-altered corn in response to concerns. The Washington Post, January 16, page A2.

Whitham, S., S. McCormick, and B. Baker. 1996. The N gene of tobacco confers resistance to tobacco mosaic virus in transgenic tomato. Proc. Natl. Acad. Sci. USA 93:8776-8781.

Whitton, J., D. E. Wold, D. M. Arias, A. A. Snow, and L. H. Rieseberg. 1997. The persistence of cultivar alleles in wild populations of sunflowers five generations after hybridization. Theor. Appl. Genet. 95:33-40.

Williams, M., R. F. Barnes, and J. M. Cassady. 1971. Characterization of alkaloids in palatable and unpalatable clones of Phalaris arundinacea L. Crop Sci. 11:213-217.

Williams, M. R. 1997. Cotton insect losses—1979 to 1996. Pp. 854-858 in Proceedings of the Beltwide Cotton Conference, P. Dugger and D.A. Richter, eds. Memphis, TN: National Cotton Council of America.

Williams, M. R. 1998. Cotton insect losses—1997. Pp. 904-925 in Proceedings of the Beltwide Cotton Conference, P. Dugger and D.A. Richter, eds. Memphis, TN: National Cotton Council of America.

Williams, M. R. 1999. Cotton insect losses—1998. Pp. 785-809 in Proceedings of the Beltwide Cotton Conference, P. Dugger and D.A. Richter, eds. Memphis, TN: National Cotton Council of America.

Wilson, H. D. 1990. Gene flow in squash species. BioScience 40:449-455.

Wilson, H. D. 1993. Free-living Cucurbita pepo in the United States: viral resistance, gene flow, and risk asessment Prepared for USDA Animal and Plant Health Inspection. Hyattsville, MD: USDA - APHIS.

Wintermantel, W. M., and J. E. Schoelz. 1996. Isolation of recombinant viruses between cauliflower mosaic virus and a viral gene in transgenic plants under conditions of moderate selection. Virology 223:156-164.

Wrubel, R. P., S. Krimsky, and R. E. Wetzler. 1992. Field testing transgenic plants. BioScience 42:280-289.