A recent inquiry from a concerned Friends of Animals supporter has shed light on the growing use of DeerPro, a deer repellent spray popular in landscaping circles. Despite claims that it’s safe DeerPro is a dangerous pesticide at its core. It contains a hazardous ingredient derived from fungus called thiram, which poses serious health and environmental risks.

The New Jersey Department of Health has classified Thiram as a mutagen and possible carcinogen. It can cause nose and throat irritation, skin rashes and may harm fetuses. Prolonged exposure can damage organs, particularly the liver, and inhaling it can result in severe respiratory issues. Gardeners cannot even purchase this product unless they are licensed professionals, as it is registered with the EPA.

In addition to its effects on human health, DeerPro, which is manufactured in Connecticut where Friends of Animals is headquartered, harms more than just deer. Thiram deters all wildlife, including species who are vital to local ecosystems. Moreover, it is highly toxic to fish, making its use near bodies of water especially dangerous.

If heavy browsing is an issue, we advocate for other methods to protect areas, like fencing that can inconspicuously protect sensitive plants in our backyards or our woodlands.

Other simple solutions include planting deer-resistant flora like lamb’s ear or boxwood, using cayenne-water sprays and putting wire cages that are at least 6 feet tall around tree trunks. Fluttering ribbons can also be used to keep deer at bay without harming animals, the environment or human health.