Larvae of the tortricid moth, Synalocha gutierreziae Powell, feed on the foliage of snakeweeds, Gutierrezia spp., which are among the most abundant and detrimental weeds in the southewest rangelands. In the laboratory, female moths deposited egg masses containing 15 to 429 eggs (x@u- = 112). At 27 degree C the mean duration of the egg, larval, and pupal stages were 9.1, 47.2 and 9.0 days, respectively. The mean preoviposition period was 3.0 days. The total generation was ca. 68.3 days long. Synalocha gutierreziae has 3 ot 4 overlapping generations each season, that each extend ca. 10 weeks. In the field, larvae were present from mid-March to late November. Several insect parasites and predators attack S. gutierreziae larvae, including Tachinidae, Braconidae, Ichneumonidae, Reduviidae, and Carabidae.