Aphid Trap Data

  • The number of cereal aphids caught in Rokeby suction trap (blue square) between the  7th and 13th of September 2017 (September  week 2) was 4 and is displayed in the graph below, along with:
    • Other aphid numbers for 2017 (orange line)
    • Average weekly temperatures for 2017 (purple line), calculated from mean daily temperatures from NIWA CliFlo data for Ashburton (Station no: 26170) and
    • The 7 year average of weekly temperature between 2010 and 2016 (red line)
    • Cereal aphid numbers for 2016 (green line)

  • Cereal aphid numbers caught in suction traps are an indication of flights and do not replace the need for direct searching and monitoring in your crop.
  • Relatively high numbers of aphids are expected till the end of May, with spring flights occurring late September or October
  • Generally the warmer the temperature, the faster an aphid will develop into an adult. However other factors, such as amount of rain, can affect aphid development and survival.
  • Notes: The Rokeby Aphid Trap being operated for Dow AgroSciences is being monitored for any incursion of Russian Aphid.

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