Abstract
Egg-laying and mining habits in the first generation of beet leaf-miner, Pegomya cunicularia (Rondani), were examined on sugar beet, Beta vulgaris, in Hokkaido, Japan. Egg masses were composed of 1-11 eggs, with 4.0 as average, and mostly laid on lower 6 leaves, scarcely on upper 7th-10th. Leaf mines were also abundant on lower to middle leaves, and more than 90% mines were concentrated on the lower 7 leaves out of 12 at the end of infestation period of the generation.
