| Summary: | The wood-borer <i>Bacchisa medioviolacea</i> Breuning (Coleoptera: Cerambycidae) is identified as a major new pest of <i>Docynia indica</i> (Rosales: Rosaceae) orchards in the northwest mountainous provinces of Vietnam. The life cycle extends over two years (721.7 days ± 17.6 days), with overwintering as larvae. Adults emerge and disperse in summer. Females lay 6–12 eggs during an oviposition period of 2–3 days, and the incubation period ranges from 27 to 38 days. The larval and pupal periods take 554–701 days and 40–59 days, respectively. Adults survive for 12–23 days. In 2019, the damage incidence (P%) and the damage index (DI) in Yen Bai, Lao Cai, Lai Chau, and Dien Bien provinces ranged from 43.5% to 71.6% and 0.80 to 1.78, respectively. Further research on the distribution and host range of <i>B</i>. <i>medioviolacea</i> is required to help formulate a management strategy for this new orchard pest.
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