The Bird-X 1 gal. Bird Stop Bird Repellent Concentrate is a food-grade taste aversion liquid bird repellent that tastes bad to birds and irritates birds' trigeminal systems (similar to our sense of smell). Applying the bird repellent spray directly to surfaces will create a safe and effective deterrent to pest birds. The liquid can be painted or sprayed onto surfaces such as grass, turf, crops and structures.