|scientific name Pachylobius picivorus |
common name Pitch-eating Weevil
Pine forests and plantations, particularly on shortleaf pine. (Franklin & Taylor, 1970).
Two peaks, March-May and July-November. Second peak spring and summer populations (Franklin & Taylor, 1970).
Large (7.9-11.1mm) dark brown or black weevils with patches of short setae on elytra (Dixon & Foltz, 1990; Nord et. al, 1984). Weevils can be sexed by presence (male) or absence (female) of indentation on the 1st visible abdominal sternite (Franklin & Taylor, 1970).
Approximately 0.7 eggs/day/female are laid on or near hosts. The larvae burrow into the root collar of the host pine and begin to feed on the phloem. Larval development lasts between 93 and 130 days and is temperature dependent, with late-born larvae having longer development times than spring-born larvae. Pupation lasts at least 16 days, and 3 days of sclerotizing occurs before emergence of the adults. Adults mate soon after emergence, with oviposition occurring within two weeks provided adequate (minimum around 15°C) temperature. Sex ratios are skewed towards females in spring, and even between sexes by the summer. Adults may overwinter, and can be found active from 1.1°C to 37.7°C. (Franklin & Taylor, 1970).
Pest of pine plantations. More common along gulf coast than the rest of range. (Nord, et al., 1984).
Feed on pine species (including shortleaf, loblolly and slash pines). Larvae eat the root collar, adults eat twigs and can cause significant economic damage (including death of trees) as a result. (Franklin & Taylor, 1970).
Eastern United States and Eastern Canada – Ontario and Labrador (O’Brien & Wibmer, 1982). More common in Southern US along the gulf coast than the rest of its range. (Nord, et al., 1984).
Commonly co-occurs with Hylobius pales (Franklin & Taylor, 1970; Nord, et al., 1984).
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