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New Zealand Plant Protection 69 (2016): 167-175

Efficacy of ethyl formate as a disinfestation treatment for codling moth (Cydia pomonella) in apples

L.E. Jamieson, N.E.M. Page-Weir, M.J. Griffin, S.P. Redpath, A. Chhagan and P.G. Connolly

ABSTRACT

Codling moth (CM, Cydia pomonella) is a pest of quarantine concern on apple exports to Asian markets. Apples exported to Japan must be fumigated with methyl bromide (MB) and then cold stored. Ethyl formate (EF), as an alternative to MB, is effective against a range of pests. This project investigated the effectiveness of EF to control an internal pest such as CM by determining the responses of key insect stages without fruit and inside apples. Trials without fruit in a 2 h fumigation showed that late-stage CM eggs and third instar CM larvae were the most tolerant life stages, requiring a mean concentration of 1.34-1.94% EF to achieve 99% mortality, but 100% mortality of 4th/5th instar CM larvae. Trials with CM in fruit in a 2 h fumigation showed that 1.13% EF resulted in 53.4% mortality of 4th/5th CM larvae inside apples. Increasing the mean concentration to 2.4% EF increased the mortality of 4th/5th larvae inside apples to 85.2%.

Keywords: fumigation, postharvest, most tolerant stage, mortality responses, methyl bromide alternative.

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