A 24 hour fumigation of in-shell pecans with methyl bromide applied at a dosage of 32 mg/liter killed 100% of larvae of Curculio caryae (Horn) inside nuts with exit holes; however, dosages of 80 and 112 mg/liter at 27 degrees and 15 degrees C, respectively, were required to kill larvae inside nuts without exit holes. A 96 hour fumigation of in-shell pecans with phosphine applied at concentrations as high as 2000 ppm gave no control of the larvae. Sorption of both fumigants by the pecans was rapid and was probably a major factor in the failure of the phosphine to control the larvae and in the need for such high dosages of methyl bromide to kill larvae in intact pecans.