I have been looking into the potential
impacts of mosquito control larvicides to non-target organisms, including native
bees (not honeybees). I have heard it argued that because mosquito
control activities are usually conducted at night (or at least at dusk), that
the risk to bees is reduced because they are no longer foraging at that time.
The counter argument is that native bees may still be exposed to chemicals
because they often spend the night at rest on flowers or plants. I have
seen Bombus males perched on flowers after dusk, and I can envision that male
bees of solitary species do the same thing. My question is do females do this
as well? Do solitary female bees that are actively laying eggs and
provisioning their nests, tunnels, etc. with food resources also spend the
evenings perched on vegetation, or are they more likely to be hanging out in their
tunnels, tree cavities, or other nesting places? If anyone has observations or
data on this topic, or any papers that address this issue that they could
share, I would be very appreciative.
Thanks very much for your help!
Wildlife and Heritage Service
Maryland Department of Natural Resources
P.O. Box 68
909 Wye Mills Road
Wye Mills ,
Office: 410-827-8612 x102