Plantskydd Deer Repellent for the Forest Industry

Plantskydd Deer Repellent has a proven 12 year record
in controlling deer and elk browse damage.

Plantskydd is used in silviculture to protect seedlings from browse damageJohn Clarke, RPF
Silviculture/Administrative Forester
Terminal Forest Products Ltd.
Richmond, British Columbia, Canada
January 2009

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Elk can feast on your trees and shrubs over winter.
Elk and deer are active all winter – feeding on your trees and shrubs.


Bill Lasuta - 35 years forestry experience.Plantskydd’s effectiveness as an animal browse deterrent has been confirmed in operational conditions since 1993 by large forestry companies on millions of conifer and deciduous trees of various species. Plantskydd’s effectiveness is attributed to its tenacity in sticking to plants, even under severe snow/rainfall – lasts up to 6 months over winter on dormant plants.



In the United States deer browse causes an estimated $750 million in damage to forest regeneration programs. Besides immediate browse damage, residual problems include: growth suppression, future yield reductions, growth deformities, regeneration delays and plant mortality where plants are repeatedly browsed or pulled out of the ground. This is a cost the forest industry can no longer afford.

Plantskydd® was first developed in Sweden in 1991 in response to commercial forest plantations being decimated by deer, moose and rabbits. The forest industry needed an animal repellent that could last through severe weather and meet Sweden’s strict environmental laws.

Plantskydd’s effectiveness as a long lasting animal browse repellent was substantiated in Field Trials 1991-1994 and the results published in the Scandinavian Journal of Forest Research – J. Berquist & G. Olander, Swedish University of Agricultural Sciences – ASA Forest Research Station, 1996.

In Canada and the United States, Plantskydd’s effectiveness as an animal browse deterrent has been confirmed since 1994 in Operational Level Field Trials undertaken by large forest industry cooperators on millions of conifer and deciduous trees of various species.

It is now considered the most cost-effective and environmentally safe animal browse deterrent available and is used by leading forest companies, nurseries, private woodlot owners, landscapers, home gardeners, as well as State/Provincial and Federal Conservation agencies.

Available in either soluble powder, pre-mix or granular formulation, Plantskydd repels: deer, elk, moose, rabbits and opossum by means of odor – which is not offensive to either applicators or planters either during or after plant treatment.


Why does it work so well?

Plantskydd works by emitting an odor that animals associate with predator activity, repelling the animal before it nibbles on plants. The odor is not unpleasant to the applicator. Research has proven that this is more effective than other repellent systems- where the animal needs to taste treated plants before being repelled. Once animals are attracted to an area and begin feeding, it is more difficult to discourage them from returning. Plantskydd stimulates a fear-based response which will have them looking for somewhere else to dine.

Plantskydd’s long-term effectiveness is attributable to its tenacity in sticking to plants—even under
severe snow/rainfall conditions—up to 6 months over winter, 3-4 months in spring/summer.


Which repellents actually work ?

” …Studies investigating trends in efficacy of deer repellents indicate that, of the 20 products tested, repellents with active ingredients that emitted sulfurous odors i.e.: bloodmeal or egg solids, generally provided the best results…”

“…Products that contained active ingredients which cause pain/irritation (capsaicin, allyl isothiocyanate), or illness (thiram) were less effective…” 

“…Products that use a bitter taste (denatonium benzoate) were usually the least effective in reducing damage by herbivores. Repellents that were applied to plant surfaces were generally more effective than capsules or other devices that produced an odor intended to protect a specific area.”

Conference Proceedings: Advances and Challenges
in Forest Regeneration, June 1-2, 2000
Dr. Dale Nolte, Dr. Kim Wagner, USDA/APHIS
National Wildlife Research Center
, Olympia, WA


The Forest Industry has conducted extensive field trials. Click here to read the research.