Aphid Trap Data

  • The number of cereal aphids caught in Rokeby suction trap (blue line) between the 21st and 27th of October  2016 (October Week 4) was 10 and is displayed in the graph below, along with:
    • Other aphid numbers for 2016 (orange line)
    • Average weekly temperatures for 2016 (purple line), calculated from mean daily temperatures from NIWA CliFlo data for Ashburton (Station no. 26170) and
    • The 6 year average of weekly temperature between 2010 and 2015 (red line)
    • Cereal aphid numbers for 2015 (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.
  • Warm conditions this autumn has seen rapid growth of early sown crops. Use a systemic insecticide such a Transform to protect new untreated growth and prevent BYDV.
  • Notes: The Rokeby Aphid Trap being operated for Dow AgroSciences is being monitored for any incursion of Russian Aphid.

    This is the last aphid trap report for 2016.  We would love to hear from you. Please email any feedback on the value of this data and also any suggestions for improvements to this report to Lisa Ransley at lransley@dow.com 

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