There are products that can be applied to grass to deter geese from feeding.
The first is methyl anthranilate (Bird Shield, Rejexit), which is the chemical food additive used to make a grape flavor. It is a natural component of concord grapes. Chemical formulations containing methyl anthranilate have been found to be effective bird aversion agents. This product tastes bad to the geese. It must be reapplied every time it rains. It is also removed by mowing.
The second is anthraquinone (FlightControl). This product does not taste bad but causes a disgestive upset when the geese ingest it. It also has a visual component and, after the geese learn to identify it, they will fly over and not stop to feed on the site. This product contains a "sticker" and will not wash off the grass. It is removed by mowing.
Check with the regulations in your state, but both of these products should be legal to be applied by homeowners. This can be done quite easily with a backpack sprayer. Follow label directions. To apply these products commercially, a pesticide applicator's license is required.
When used correctly, turf deterrents are very effective as a goose management tool.
Resources: (online)
