Soil treatments against replant pests and diseases

March 2008 | Dr Gordon Brown | Future Orchards® notes

These Future Orchards® notes examine soil treatments used when redeveloping orchard ground affected by replant pests and diseases. The objective is to remove or reduce biological constraints before the new root system is expected to establish and fill its allotted soil volume.

The resource links replant disease directly to orchard economics. Future Orchards® planning material from this period warns that the presence of specific apple replant disease can depress cumulative yield dramatically over the first seven years, a loss that is difficult to recover later.

Brown’s notes therefore position soil treatment alongside other pre-plant fundamentals such as correcting pH and major nutrient deficiencies, completing adequate cultivation and ensuring good soil-to-root contact. Dwarfing rootstocks are particularly dependent on strong establishment conditions.

The material is historical and product availability has changed. Growers should use the principles—diagnose risk, prepare the soil properly and treat problems before planting—while checking current registrations and professional recommendations for any treatment decision.

In this context, pre-plant treatment is part of a broader establishment system rather than a stand-alone input; soil chemistry, cultivation, drainage, irrigation capacity and planting quality all influence whether the new orchard can exploit the treated soil.