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Aphid Trap Data - Rokeby, Canterbury, NZ

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The aphids are back!


The number of cereal aphids caught in our Rokeby suction trap (blue line) between the 9th and 15th of November (Nov week 3) was 22 and is displayed in the graph below, along with;

·         Other aphid numbers for 2021 (orange line)

·          Average weekly temperatures for 2021 (purple line), calculated from mean daily temperatures from NIWA CliFlo data for Ashburton (station no. 26170) and

·         The 10 year average of weekly temperature between 2010 and 2020 (red line)

·         5 year average of cereal aphid numbers for Rokeby (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.

Learn more about controlling aphid infestations in your crop with Transform Isoclast active Insecticide here.

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