Treating tobacco beds with methyl bromide for the purpose of killing weed seed has become very popular in recent years. The gas is effective except on the seed of white clover and when the soil temperature is below 50° F.
Massie, Ira E.; Everette, George; and Smiley, Jones H., "Fall Treatment of Tobacco Beds with Methyl Bromide" (1963). Agronomy Notes. 151.