I can't chase them off before they nest because they nest at the neighbors pond 300 yards down stream . But as soon as the young are hatched here they come because I have better clover plots around the pond, As soon as they show up I start shooting the water bugs on the pond surface. Takes about 3 target practice sessions and they usually won't come back except once in a while to "test the water". You need to be persistent.

Now they show up for early goose season and its a different story.Clover stuffed goose breast . Yum !