Are all weevils nocturnal?
Crop insects as a rule are not so much nocturnal or diurnal (terms used
mostly with advanced animals), but respond to temperature just as much or
more than they do to light cycles. Their need for rest periods are real,
however, on warm days they may be more active during the early daylight
hours and the late daylight hours due to the temperature moderations. Many
of these insects may be active at night when the day is too hot or may be
active during the day when the nights are too cool. Keep in mind that
insects are not able to control their internal temperature, so the
environmental temperature is important to determine whether they will be
active or not.
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Update: June 2012