University of Maryland Extension

Deer

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two deer browsing

 Deer feed on the buds, leaves, and stems of many ornamental plants. High populations can cause serious damage to farms, orchards, nurseries, and suburban properties. 

deer damage on arborvitaeDeer damage may first appear as general thinning on lower of branches, especially on yews.  Twigs and stems have a torn, jagged appearance. Because deer have no upper incisors, they must tear or jerk plants when feeding. Rabbits and rodents usually clip stems neatly, at a 45-degree angle. The height at which damage occurs, from ground level to about 6', often rules out other animal damage.

Deer can also severely damage shrubs and trees by rubbing their antlers to remove the velvet covering. Antler rubbing usually occurs on small flexible saplings, tree trunks, and limbs. Damaged bark may have vertical scrapes and shredded areas with the underlying wood exposed. Male deer, or bucks, develop antlers from April through August. The antlers are covered with surface "velvet", a soft vascular material that helps to nourish the antlers as they develop. During the fall breeding season the velvet dries and is rubbed off as the antlers are polished. Antlers are shed in midwinter.

scraped bark off trunk of tree
Antler rubbing damage to tree trunk

feeding damage on an evergreen
Deer feeding damage

deer damage on Aucuba
Aucuba shrub damaged by deer feeding

Management

Begin repellants or scare devices as soon as you notice deer activity. Control is more likely if deer do not form a habit of browsing on your property. For best results, alternate deer control methods. Deer are extremely adaptable and quickly become accustomed to new sounds and smells. When landscaping, choose ornamentals that are rarely or seldom damaged by deer. Under severe weather conditions, deer may feed on any plant material. Refer to (PDF) FS 655, "Resistance of Ornamentals to Deer Damage (also look at the (PDF) Addendum to Wildlife Damage Management  Resistance of Ornamentals to Deer Damage - Invasive Plant Alert!) and (PDF) FS 810, "Using Commercial Deer Repellents to Manage Deer Browsing in the Landscape".

To determine the most effective control, consider the pattern of damage, the deer population, site characteristics, and the economic impact of the damage. In general, summer damage is less extensive than winter damage, and can be controlled using repellants, scare devices, or low cost temporary fencing. Permanent fencing, to prevent long term damage to trees and shrubs, may be the only realistic solution to winter deer browsing. Ask yourself how much time and money you are willing to spend to reduce deer damage. What is the value of the plant material you are losing? Base your deer control program on the most severe damage occurring in a 5-year period. Investigate deer population, density, and travel routes in your area through the Department of Natural Resources. This information, as well as site considerations, such as lot size and local covenants, will help you decide the best combination of deer control options.

Effective controls for antler rubbing damage include fencing, scare devices, and tree protectors. Fencing and other deer control methods are discussed in detail in (PDF) Bulletin 354, "Controlling Deer Damage in Maryland." Tree protectors, such as plastic tree wrap, tubes, or 4' woven wire cylinders, provide a physical barrier to prevent damage. Repellants are not an effective control against antler rubbing.

ragged deer feeding damage
Damage to leaves and stems has a ragged appearance

Deer Management in a Vegetable Garden

View Fencing videos on YouTube

Deer fencing ideas from the Grow It Eat It Blog

Power Point- Gardening in Deer Country - Bob Nixon, Howard Co. MG

 

 

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