Nutrient and mineral excesses
Nutrients, salts, and pesticides can be toxic to plants if present in excess amounts or if applied incorrectly. Excess concentrations of one nutrient can reduce the availability of other nutrients. Toxicity symptoms include leaf tip dieback, marginal leaf chlorosis, necrosis (or burn), branch dieback, and pest problems.
Avoid nutrient disorders by preventing root disease development, providing good drainage, and using good practices during fertilization and irrigation. Make sure
that herbicides don't drift over into your landscape plants.
For more information refer to the publication Abiotic Disorders of Landscape Plants.
to leaf margins of maidenhair tree due to salt toxicity
Salt toxicity to coast redwood
Chlorotic sweet gum leaves due to alkaline soil