Developing strategies to manage highly phosphine resistant populations of flat grain beetles in large bulk storages in Australia

  • M. Nayak Cooperative Research Centre for National Plant Biosecurity; Agri-science Queensland, DEEDI, Indooroopilly, Brisbane, 4068, Australia
  • J. Holloway Cooperative Research Centre for National Plant Biosecurity; Primary Industries, Industry & Investment NSW, Wagga Wagga Agricultural Institute, Pine Gully Rd, Wagga Wagga New South Wales 2650, Australia
  • H. Pavic Cooperative Research Centre for National Plant Biosecurity; Agri-science Queensland, DEEDI, Indooroopilly, Brisbane, 4068, Australia
  • M. Head Cooperative Research Centre for National Plant Biosecurity; GrainCorp Operations Ltd, PO Box 360, North Geelong, Victoria 3215, Australia
  • R. Reid Cooperative Research Centre for National Plant Biosecurity; GrainCorp Operations Ltd, 16 Mann St., Toowoomba, Queensland 4350, Australia
  • C. Patrick Cooperative Research Centre for National Plant Biosecurity; Agri-science Queensland, DEEDI, Indooroopilly, Brisbane, 4068, Australia

Abstract

Development of high level resistance to phosphine fumigant in flat grain beetles (Cryptolestes ferrugineus) in large bulk storages in Australia poses a serious threat to the biosecurity of Australian grain. The level of resistance in this species is the highest ever detected in any stored grain insect pest in Australia with a resistance factor of 875. Laboratory studies showed that at 0.5 mg/L and at 1 mg/L of phosphine 30 and 24 days are required, respectively, to attain population extinction. These doses are currently being tested in field trials for their validation. Moreover, we have developed an action plan in collaboration with project scientists and the major Australian bulk handling companies aimed at eradicating infestations of phosphine resistant flat grain beetles and preventing their spread. The key components of this plan include the use of grain protectants and sulfuryl fluoride to eliminate phosphine-resistant populations, adoption of an intensive hygiene program and monitoring of insect populations through inspection, sampling and resistance testing.

Keywords: Flat grain beetle, Cryptolestes ferrugineus, Phosphine, Resistance, Fumigation protocols
Veröffentlicht
2010-09-02
Rubrik
Section: Fumigation, Modified Atmospheres and Hermetic Storage