I'd be surprised if the pollen collected from pollen traps would
still be useable for pollination of sunflowers.  Bees typically
use regurgitated nectar to moisten pollen for packing it into
corbiculae.  This might have a negative effect on viability, and
would probably make it difficult to restore the pollen to a form
useful for pollination.  Not a lot is known about the lifetime of
viable pollen grains, but in some species it's measured in hours,
so unless the pollen were collected immediately from the trap it
might not still be viable.  If you want to test pollen grains for
viability you might look at the book 'Techniques for Pollination
Biologists', by C. A. Kearns and D. W. Inouye. University Press
of Colorado, Niwot, CO.
 
Dr. David W. Inouye
Dept. of Zoology, University of Maryland, College Park, MD 20742
E-mail: [log in to unmask]
Phone:  301-405-6946
FAX: 301-314-9358