Foliar Spray Toxicity

Symptoms

Foliar spray injury appears as desiccation of the foliage that is contacted by the chemical or salt spray. Necrotic spotting and extensive leaflet tip necrosis are typical symptoms (Figs. 1 and 2). Depending on the chemical and its concentration, some palms may be killed by the spray, while others may experience only localized injury and new growth will appear normal.

Cause

Salt spray from the ocean or intentional or accidental spray applications of toxic chemicals to the foliage can cause necrosis and desiccation of the foliage contacted by the spray.

Occurrence

Foliar salt injury is fairly common along seashores during dry periods with strong onshore winds. Many species are affected by salt spray, but Cocos nucifera, Serenoa repens, Allagoptera arenaria, Hyophorbe spp., Coccothrinax spp., Thrinax spp., and Pseudophoenix spp. are most tolerant of seashore conditions. Sprays of toxic chemicals can affect almost any species.

December 1, 2010