Hylobius abietis (L.) (Coleoptera:Curculionidae) is the major insect pest o
f forest regeneration in Europe, where adult weevils kill conifer seedlings
by feeding on the bark. This study demonstrates that pine weevils also fee
d extensively in the crowns of mature coniferous trees. Crown feeding prima
rily took place during a limited period immediately after the migration to
new breeding sites (roots of freshly cut coniferous trees). The weevils rea
ched the crowns mainly by flight and tended to concentrate on trees in fres
hly cut-over areas. The proportion of sexually mature females successively
increased during the crown-feeding period, indicating that they require a c
ertain period of maturation feeding. The pine weevils fed on twigs of 3-20
mm thickness, and they consumed about 0.2-0.3% (200 cm(2)) of the total bar
k surface in the frowns of mature Scots pine trees. Calculations suggested
that the amount of food consumed in the trees surrounding a fresh clear-cut
ting should have met the nutrient requirements of the weevil population in
the area during the maturation feeding period. In the crowns of shelterwood
trees, about 50 cm(2) of the bark was consumed per tree (0.63 m(2) ha(-1))
. This level of consumption is not believed to be high enough to relieve th
e feeding pressure on seedlings and thereby explain the low level of damage
usually found under shelterwoods.