Abstract
Life history and mortality factors of Styloxus bicolor (Champlain and Knull) were studied on its host, one-seed juniper, Juniperus monosperma (Englemann) Sarg., in northern Arizona from 1982 to 1986. Adults emerged from juniper branches in early August. Larval development was completed over a 3-yr period. Each year the larva created a circumferential gallery (a flattened spiral cut severing the xylem) at the nearest branching point. This is a previously undescribed life history strategy for a cerambycid with a multiple-year life cycle. Mating and oviposition behavior of the adults and larval gallery construction are described. A survivorship curve showed that 10.8% of the 1983 cohort survived to adults, 15.7% died from natural enemies, 34.3% died from branch breakage at the circumferential gallery, 16.0% died from resinosis, 3.8% died in long travel galleries, and 19.1% died of desiccation or disease.
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