The highest concentrations in plants grown on soils that have been fumigated with methyl bromide occur during the first year following fumigation.

The authors wish to thank the following for assistance in this research: Keith W. Bowers, L. Todd Browne, Arthur S. Greathead, James J. Kissler, Donald A. Luvisi, Vincent H. Schweers, William S. Seyman, Robert W. Sheuerman and Norman C. Welch, Farm Advisors in Napa, Fresno, Monterey, San Joaquin, Kern, Tulare, Santa Clara, Merced, and Santa Cruz counties, respectively; T. Hales and Lloyd M. Harwood, formerly Farm Advisors in Orange and Sonoma counties, respectively; Pat Hoffmann, formerly Laboratory Assistant, UC, Davis; Norman O. Jones, SRA, Department of Nematology, UC, Davis; Richard E. Pelton, SRA, Cooperative Extension; and Ronald E. Voss, Extension Vegetable Specialist.

The authors wish to acknowledge partial financial support from the Kearney Foundation of Soil Science.