Lessons from replanting at Outback Almonds
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From page 39 Diagnosing replant disease in orchards is difficult without controlled comparisons. This study assessed how soil fumigation and amelioration influenced tree growth and survival under replant conditions. The site had high pH and sodic soils, and trees were replanted into the same rows as the previous orchard, increasing replant risk. Treatments compared virgin soil, treated replant soil and untreated replant soil. After tree removal, the treated strips were fumigated with Agrocelhone C-80 at 350kg / ha to a depth of 250 mm. Soil was sealed for seven days and planting was delayed for four weeks. Gypsum and compost were applied after fumigation to improve soil condition. Trees were replanted in July 2024 using almond varieties Non pareil, Carmel and Wood Colony on Cornerstone rootstock. One row was left untreated. As part of Hort Innovation funded project AL22002, Agriculture Victoria assessed tree performance annually by measuring trunk diameter, a reliable indicator of growth suppression associated with replant disease. Measurements taken at approximately 40cm above ground revealed clear differences among treatments. Treated trees grew best, with trunk diameter increasing by 12mm from 2024 to 2025. Trees in virgin soil grew by 6mm, while untreated replant trees grew by only 2mm. Tree survival data collected by Tom showed losses were low in the first two years after replanting. Mortality varied among varieties, with the highest mortality reaching 18 % for Wood colony in treated replant soil compared to only 4 % in virgin soil( Figure 1). Nonpareil planted into the treated area survived at the same rate as those planted into virgin soil indicating that there was no effect on these trees of replanting in the previously used block( Figure 1). These results demonstrate a strong association between soil treatment and both tree growth and survival under replant conditions.
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40 In A Nutshell- Spring 2026 Vol 27 Issue 3