If they're breeding/nesting at your pond each year - try finding and disposing of their eggs. They usually lay and leave. This way you will cut down on the population increases. If there are several generations of geese using the pond you'll have a very hard time getting rid of them with non lethal means

Mat Peirce
1.25 acre southeast Iowa pond
LMB, BG, YP, WE, HSB, RES, BCP