Tomato pinworm occurs principally in tropical tomato-growing areas where winters are mild, particularly Florida, the lower Rio Grande Valley in Texas, southern California, and Mexico. It is not an important pest of fresh market and processing tomatoes in California's major growing region of the central San Joaquin Valley, primarily because of the short production season and cold winters. But it has become a major pest of cherry tomatoes in that area, probably as a result of the long production season and cultural practices unique to this crop. Larvae of tomato pinworm (TPW), Kieferia lycopersicella, cahe most serious damage when they enter t the fruit, although they also mine the foliage. Two cherry