In laboratory studies, neither germination nor quality of peanuts was adversely affected by fumigation with phosphine, regardless of the dosage or the number of times the peanuts were fumigated. Sorption of phosphine ranged from 55.3 to 71.1% and was highest for peanuts with 7% moisture content. Residues of phosphine generally increased with dosage and the number of fumigations; however, the highest residue (11.3 ppb) occurred after 3 fumigations at the highest dosage (1.12 mg/liter). Methyl bromide fumigation of peanuts in the laboratory reduced germination and quality in direct proportions to the dosage applied and the number of fumigations.