Observations were conduted aiming to determine some comparative parameters of the twig girdler Oncideres impluviata (GERMAR, 1824) (Coleoptera: Cerambycidae) biology when parasiting red angico, Papapiptadenia rigida (Benth.) Brenan (Leguminosae-Mimosoida), in Santa Maria, RS state, and capororoca, Rapanea umbellata (Mart. ex D.C.) Mez (Mysinaceae), in São Sepé, RS state, during 1990/92. Measurements were taken of the adult emergence holes as well as the length and volume of larvae-pupae gallery. O. impluviata presents an emergence hole which is almost circular and develops in branches of variable diameters independently of the botanical species and the gallery length and volume are similar on both botanical species.
biology; twig girdler; Oncideres impluviata; Papapiptadenia rígida; Rapanea umbellata