Aphid Trap Data

  • The number of cereal aphids caught in Rokeby suction trap (blue square) between the  19th and 25th of October 2017 (October week 4) was 121 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.
  • Hot off the Press! Latest FAR research confirms Transform is the most persistent foliar insecticide in spring sown cereals. Click here to read the full article.

    Next week will be our last report for 2017, we welcome feedback, please send any comments or suggestions to lransley@dow.com.  If you don't currently receive the Aphid Trap data by email you can  Subscribe to receive the 2018 weekly Aphid Trap Data direct to your Inbox here.

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