Do not plant susceptible species on soils with a high pH. Acidify the soil. Best results have often come with a mix of a fast acidifier, a slow acidifier, and organic matter. Repeat as necessary . Apply a chelate as a soil drench if one micronutrient is involved. Repeat as necessary.
Tree injection works well, but requires multiple and repeated wounding.
Spraying is ineffective, because crown coverage is difficult and marginal leaf scorch is easy.