Imports of fruit from the south of the Far Eastern region of the USSR into other parts are subject to quarantine regulations because of the danger of spreading Popillia japonica Newm., Carposina sasakii Mats., Numonia pirivorella (Mats.) and Agrilus mali Mats. to districts as yet uninfested. Carposina and Numonia have only one generation a year. The first may be spread with peach fruits and planting material, and the second only with planting material of pear, since infested pear fruits are seldom picked because of their appearance. Both can be controlled by fumigation with methyl bromide, and suitable exposures for quarantine purposes are detailed. P. japonica occurs only in the South Kurile region of Sakhalin, on the island of Kunashir. It is also susceptible to methyl bromide, and effective programmes are noted. In tests with A. mali, infested apple shoots were fumigated in the laboratory. The numbers of gramme-hours required for mortality were 130-135 at 14-15 deg C, 127 at 18 deg C and 195 at 7-8 deg C.