Pissodes terminalis (Curculionidae)
lodgepole pine terminal weevil
||5-7 mm long, mottled yellowish brown in colour. Notice the
well-developed snout and clubbed antennae, which are characteristic of this
||Very similar to
P. strobi. Larvae make
cocoons in the pith of current year's leader.
||Egg deposition is on the current year's leader. Young larvae
mine individually in the phloem-cambial region in an upwards direction towards
the expanding bud. Mature larvae feed and pupate in the pith region. This
activity results in the death of the current years' leader, in contrast to
P. strobi, which damages
two or more years of growth.
Infestation of saplings by P. terminalis results in forking and heavy
branching. This leads to a non-merchantable stand. This insect is of concern
to foresters in the interior since it thrives on the thicker leaders of trees
in well spaced stands.
References and Links:
EAG: 556, 558; FC: 334.
See HForest for the PFC pest leaflet, or JP17.
And, see the BC Forest Practices Code Terminal Weevils Guidebook (1996), which
describes the life history, impact, survey methods, and management options of
the terminal weevils, Pissodes strobi, the spruce weevil and Pissodes terminalis,
the lodgepole terminal weevil, in young stands in BC.