Say good-bye to black flies, ticks & mosquito's. Safe, organic control for dangerous and nuisance biting pests. Our all natural repellant will also keep the deer from eating your favorite plants. Enjoy spring without black flies and summer evenings without mosquito's. Seasonal discounts available. Free estimates. Prices vary depending on specific application, but average price for 1/4 acre spray application is $69, with about +$10 for each additional 1/4 acre. Great for your job site too. work outdoors without black flies and mosquitos.