Technical Abstract: Bactrocera latifrons (Hendel), a tephritid fruit fly first detected in Hawaii in 1983, primarily infests fruits of solanaceous plants. One area not yet sufficiently understood is the population ecology of this species. In general, it has been observed to maintain relatively low population densities, though higher population levels have been found in areas having turkeyberry (Solanum torvum Sw) patches. Because sequential flowering in turkeyberry can lead to a steady production of fruits, areas with abundant patches of turkeyberry also provide a good model system of the potential pest status of B. latifrons in continuously cultivated solanaceous crops such as peppers (Capsicum spp.) and tomatoes (Lycopersicon esculentum Mill.). Here we report on the population levels of B. latifrons as they relate to turkeyberry phenology in the vicinity of Haiku, Maui. Turkeyberry plants went from a near absence of flowering in January to heavy flowering in early March. Turkeyberry fruits reached the ripe stage an average of 16 weeks from the fully open flower stage. Ripe fruits, almost absent in January – February, became abundant by June, and peaked in mid-July, 18 weeks after the first heavy flowering period. Peak pupal recovery occurred two weeks after the ripe turkeyberry fruit peak. Average adult B. latifrons catch, in traps baited with the male lure (alpha-ionol + cade oil), peaked in late August, four weeks after the pupal recovery peak. The observed timings of pupal and adult peaks are consistent with known B. latifrons development times. These results document that B. latifrons has population cycles determined by host plant fruiting cycles as seen in other tephritid fruit fly species. Knowledge of population cycles can help in the planning of suppression programs. At present, sterile insect technique (SIT), bait sprays, and destruction of weedy hosts seem to have the greatest potential for suppression of B. latifrons populations, but further research is needed on the effectiveness of these techniques.