Migrate Turf Spray repellent makes vegetation inedible to geese and ducks. Made of nontoxic grape extract and food-grade methyl anthranilate that is distasteful to geese. Simply spray directly onto grass areas in golf courses, parks and fields, anywhere that congregating geese or ducks are a problem. When the birds start to graze, they find the grass inedible and move on. Repellent lasts 3 months and will not wash off with rain or Bird-B-Gone, Inc., Mission Viejo, Calif.. One gallon covers 16,000 sq. ft.