Effect of various heat treatments to target apple leafcurling midge (Dasineura mali) cocoons on apples

  • Natalie E.M. Page-Weir Plant & Food Research
  • Lisa E. Jamieson Plant & Food Research
  • Amanda J. Hawthorne Plant & Food Research
  • Reuben T. Wilkinson Plant & Food Research
  • Dominic E. Hartnett Plant & Food Research
  • Simon P. Redpath Plant & Food Research
  • Asha Chhagan Plant & Food Research
  • Allan B. Woolf Plant & Food Research
  • Lindy F. Guo Plant & Food Research
Keywords: Apple leafcurling midge, controlled atmosphere temperature treatment, hot high pressure washing, hot water drench


New Zealand apples infested with apple leafcurling midge (ALCM) cocoons are a quarantine issue for growers exporting to many markets. The presence of ALCM on apples in these markets requires fumigation with methyl bromide, which decreases fruit quality. The effectiveness of various forms of heat treatments on ALCM were evaluated as alternatives. Apples infested with ALCM cocoons were subjected to one of the following heat treatments: Controlled Atmosphere Temperature Treatment System (CATTS; 1% O2, 15% CO2, 46°C, 3 h), hot air (46°C, 3 h), hot water high pressure washing (hot-HPW; 55°C, 100 psi, 15—20 s), or hot water drench (HWD; 55°C, 40 psi, 15—20 s). ALCM removal and mortality were assessed 7-days post-treatment. The hot-air and CATTS treatments provided the greatest control, with 82.2 and 92.2% mortality respectively. More cocoons were removed with hot-HPW (46.6%) compared with ambient-HPW (27.1%). Neither HWD nor hot-HPW increased mortality of cocooned ALCM over that in untreated controls. ALCM cocoons are particularly difficult pests to remove/kill; further research should focus on incorporating multiple control measures into the current systems approach.

How to Cite
Page-Weir, N., Jamieson, L., Hawthorne, A., Wilkinson, R., Hartnett, D., Redpath, S., Chhagan, A., Woolf, A., & Guo, L. (2018). Effect of various heat treatments to target apple leafcurling midge (Dasineura mali) cocoons on apples. New Zealand Plant Protection, 71, 299-305. https://doi.org/10.30843/nzpp.2018.71.150
Vol 71 Apple Pests 2018

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