Ann. Rev. Entomol. 50:31-52.

Ye, X., S. Al-Babili, A. Kloti, J. Zhang, P. Lucca, P. Beyer et al. 2000. Engineering the provitamin A (beta-carotene) biosynthetic pathway into (carotenoid-free) rice endosperm. Science 287:303-305.

Yussefi, M. and H. Willer. 2003. The world of organic agriculture—statistics and future prospects. Available at http://www. ionenviro.com/pdf/ORGANIC%20 STUDY%202003.pdf. IFOAM, Bonn.

Zangerl, A.R., D. McKenna, C.L. Wraight, M. Carroll, P. Ficarello, R. Warner et al.

2001. Effects of exposure of exposure to event 176 Bacillus thuringiensis corn pollen on monarch and black swallowtail caterpillars under field conditions. PNAS 98:11908-11912.

Zhang, H.X., and E. Blumwald. 2001. Transgenic salt tolerant tomato plants accumulate salt in foliage but not in fruit. Nature Biotech. 19:765-768.

Zhang, H.X., J.N. Hodson, J.P. Williams and E. Blumwald. 2001. Engineering salt-tolerant Brassica plants: Characterization of yield and seed oil

quality in transgenic plants with increased vacuolar sodium accumulation. PNAS 98:12832-12836.

Zwahlen, C., W. Nentwig, F. Bigler, and A. Hilbeck. 2000. Tritrophic interactions of transgenic Bacillus thuringiensis corn, Anaphothrips obscurus (Thysanoptera: Thripidae), and the predator Orius majusculus (Heteroptera: Anthocoridae). Environ. Entomol. 29:846-850.