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Tree & Shrub Salt Damage

Injury due to salt is most common on landscape plants growing adjacent to highways, streets, sidewalks, and driveways that are regularly salted during the winter for ice control. Most of the salt used for deicing purposes is sodium chloride, ordinary rock salt or table salt. On highways, the major problem to plants is caused by salt spray kicked up by fast moving traffic on wet, salted roads. The salt spray is deposited on adjacent plants causing dehydration of evergreen leaves. In the city, the major problem is salt runoff washing into the soil. Salt in the soil may be absorbed by the roots and cause direct toxic effects.

Symptoms and Diagnosis

Tree Salt

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Salt spray causes bud death and twig dieback. Subsequent shoot growth at the branch base produces clusters of twigs known as “witches’ brooms.” Symptoms typically become evident in the spring. In evergreens and conifers, salt spray causes leaf browning or yellowing, needle tip flecking, and twig dieback. Salt in the soil is slower acting and may not affect plants for several years. Symptoms include an initial blue green cast to the foliage, marginal leaf burn or needle tip burn, reduction in leaf, flower and fruit size, premature fall coloration and defoliation, stunting, and a general lack of vigor. The symptoms often become evident in late summer or during periods of hot dry weather.

Mark Schlossberg

Mark Schlossberg is the President of ProLawnPlus in Baltimore, MD. He graduated from the University of Maryland in 1977 with a B.S. in agronomy. He is the President of the Maryland Association of Green Industries, and past president of the Maryland Turfgrass Council.

Commercial Lawn Care Lawn Care and Maintenance Pro-Lawn-Plus Tree and Shrub Care2 comments

2 Comments
  1. Jeff Spokes says:

    What do you recommend to treat this damage? Should we cut back the browned part?

    • Flushing well-drained soils at the end of the winter, or incorporating gypsum or a similar commercial product into the soil before winter begins, has been found to reduce salt damage in some cases. As far as the browned areas go, you should wait until new growth starts coming out to see what is actually dead.

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