-- These weevils attack both red and white oaks and are found wherever
the hosts grow. Also, weevils in the genus Conotrachelus and
moths in the genus Melissopus account for some losses. A major
portion of the crop may be destroyed.
Insect (figure 42a). -- Acorn weevils are robust and brown. The
beak is long and slender, sometimes longer than the body, in the female.
The larvae are legless, robust, dirty white, and C-shaped.
the Injury (figure 42b). -- There may be one or more holes in the
acorn. Dissecting the acorn will reveal signs of feeding and one or
more C-shaped larvae.
-- Female weevils drill one or more holes into the acorn and deposit
a single egg in each hole. Larvae feed until full grown, then cut exit
holes in the shell. Full-grown larvae enter the soil where they spend
1 to 2 years before pupating and emerging as adults.
-- Natural controls help to minimize losses. Chemical control may be
needed in seed orchards.