The daily pattern of pollen-foraging activity ofApis melliferaL. was observed onZea maysL. from mid-July to mid-August at Newark, Del. Foraging occurred from 0600 to 1500 h (EDT), and the peak abundance of pollen-collecting bees was between 0900 and 1000 h on field and sweet corn. These data indicate that insecticide application to corn should be timed to avoid this peak foraging activity of the honey bee.