APPENDIX B COMMERCIAL APPLICATION OF METHYL BROMIDE In this appendix, application rates for the two most common formulations of methyl bromide are presented. Terr-O-Gas is a mixture comprised of 67 percent methyl bromide and 33 percent chloropicrin. It is used in those cases where fungus infestation is of prime concern. Brom-O- Gas is comprised of 98 percent methyl bromide and two percent chloropicrin. Brom-O-Gas is used more widely than Terr-O-Gas.