Chilling injury - Some of the common symptoms of chilling injury are surface pitting, increased susceptibility to attack by weak and aggressive pathogens, and surface and internal necrosis. This can cause direct cell necrosis and even long cracks in the trunk of vines and trees. Other possible symptoms are wilting, scorching of leaves and loss of leaves. Unfavourable light intensity - Insufficient light may cause etiolation , stunting, reduced flowering, premature leaf fall and other abnormalities. High light intensities can scorch or roll leaves, dry up flowers, and accentuate spray damage.
Wind can also carry spores of pathogens.
Conversely, stagnant air can cause major air pollution problems. The symptoms of air pollution are dependant on the type of pollutant, and may result in plant toxicity leading ultimately to death. These chemicals include fertilisers, fungicides, insecticides, herbicides, stimulants, diluents, stickers and spreaders, and special action chemicals. Others - Hail, ice and lightning can not only damage plants, but also produce wounds through which many pathogens may cause infection. It is usually directed at plant populations rather than at individual plants.