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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