Psilopa leucostoma a New Leaf Miner of Sugar Beets in the United States12

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Abstract
Psilopa leucostoma (Meigen) was first observed as a pest of sugar beets in the United States at Umapine, Oregon, in 1962. Observations made through 1965 showed it to be generally distributed in the major producing areas of Washington, Oregon, Idaho, and northern Utah. Primary damage to beet plants consists of as many as 50 narrow serpentine mines, usually less than 2 cm long, on a single beet leaf; but the greatest damage is caused later by (death, from an unknown cause, of patches of leaf tissue around the mines. The insect is likely to become a more serious pest of sugar beets and table beets than the spinach leaf miner, Pegomya hyoscyami (Panzer), because it attacks the plants later in the season. It is believed to be a different biotype from the insect that attacks common lambsquarters, Chenopodium album L. It has apparently become adapted to sugar beets grown in irrigated areas on the salt or alkaline soils of the West.

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