Effect of heat or chemical disinfection on the viability of ‘Fuji’ apple graft wood

  • Brent M. Fisher Plant & Food Research
  • Duncan I. Hedderley Plant & Food Research
  • Nicholas T. Amponsah Plant & Food Research
  • Reiny W.A. Scheper Plant & Food Research


Bundles of dormant wood were submerged in water (45°C for 45 min or 50°C for 15 min), or were wrapped in moist cloth, placed inside zip-locked bags and submerged for 3–6 h or treated with one of three GRAS chemicals or untreated (two bundles per treatment). Scion wood was grafted onto ‘M9’ rootstocks then planted in a randomised order, with growth assessed after 16 weeks. Two of the GRAS treatments and submersion at 45°C for either 45 min or 3 h in a bag did not significantly affect viability compared with the untreated control (83–95% viable). Submersion at 50°C for 15 min reduced viability significantly (70%). Scions did not survive exposure to 50°C for 3–5 h in bags (P<0.001).  No significant differences in mean scion shoot length were observed between the untreated wood (107 cm) and that submerged in 45°C water for 45 min, 3 h in a bag, or GRAS-treated. Wood treated at 45°C for 5–6 h in a bag or at 50°C for 15 min had significantly shorter shoots (54–75 cm, P<0.001). Dormant ‘Fuji’ wood remained viable after treatments known to eliminate pathogens from wood.

How to Cite
Fisher, B., Hedderley, D., Amponsah, N., & Scheper, R. (2018). Effect of heat or chemical disinfection on the viability of ‘Fuji’ apple graft wood. New Zealand Plant Protection, 71, 354. https://doi.org/https://doi.org/10.30843/nzpp.2018.71.213
Vol 71 Poster Abstracts 2018

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