Summary information for 01-09-2021 through to 09-09-2021

Sample data for 01-09-2021 through to 09-09-2021

Region Samples Mean PVY Index per Sample Mean Colonising Aphids per Sample Mean Aphids per Sample Total aphid species
North Scotland 2 5.49 4.00 31.50 12
Grampian 4 3.42 1.75 22.00 17
TOTAL 6 4.11 2.50 25.17 21

Sample data for 2021

Region Samples Mean PVY Index per Sample Mean Colonising Aphids per Sample Mean Aphids per Sample Total aphid species
North Scotland 114 1.12 0.32 8.51 41
Grampian 176 3.19 1.39 15.21 66
Angus & Perthshire 90 1.94 0.74 10.01 53
Borders 62 0.73 0.48 4.42 39
Northern England 147 8.09 1.45 23.88 58
Midlands 96 19.38 3.70 60.07 71
East Anglia 169 3.94 2.36 10.17 60
South-West 111 7.15 3.04 22.49 57
TOTAL 965 5.61 1.74 18.98 103

View a regional breakdown of the sites with the greatest PVY index

Summary information as of 09-09-2021

  • North Scotland (2 samples), Grampian (4 samples) - Moderate Risk

  • North of Scotland: Virus pressure was Moderate, double the average for the time of year. Peach-Potato aphids were found at 4 sites, Potato aphids were found at 4 sites ((numbers still 2x greater than average for the time of year)); Other potato virus vectors present: Bird Cherry-Oat aphid, Leaf Curling Plum aphid, Black-Bean aphid (a good vector of PVA, numbers were 2x higher than average for the time of year), Pea aphid, Currant-Sowthistle aphid (50% higher than average).
  • Grampian: Virus pressure increased to Moderate, average for the time of year. Peach-Potato aphids were found at 3 sites, Potato aphids were found at 2 sites; Other potato virus vectors present: Bird Cherry-Oat aphid, Leaf Curling Plum aphid, Black-Bean aphid (a good vector of PVA, Currant-Sowthistle aphid (50% higher than average), Willow-Carrot aphid (50% higher than average).
  • Angus and Perthshire: No samples received.
  • Borders: No samples received.
  • Northern England: No samples received.
  • Midlands: No samples received.
  • East Anglia: No samples received.
  • South-West: No samples received.

  • Monitoring in seed potatoes is now coming to an end at most sites in Scotland and has finished in England.
  • 967 samples have been received so far this year. 
  • Peach-Potato aphid and Potato aphid were found in both North Scotland and Grampian this week, as was Black-Bean aphid - this is a good vector of PVA.
  • Willow-Carrot aphid was recorded from Grampian.
  • Pea aphid was recorded from North Scotland.
  • Leaf-Curling Plum aphid, Currant-Sowthistle aphid and Bird Cherry-Oat aphid were recorded from both regions.
  • Overall aphid numbers have dropped throughout the country, with almost every species either at or below average numbers. The exceptions being 1) North Scotland: Potato aphid and Black-Bean aphid both at 2x the longterm average, with Currant-Sowthistle aphid at 50% higher. 2) Grampian: Potato aphids at double the long term average for the time of year, Currant-Sowthistle aphid and Willow-Carrot aphid both found in numbers 50% greater than the long term average.
  • Black-Bean aphid was recorded from North Scotland and Grampian - this is a good vector of PVA.
  • Willow-Carrot aphid was recorded from Grampian.

  • You can check the current data for GB on the map on the website (https://aphmon.fera.co.uk/). Use the slider at the top right to move back through the year and the slider on the bottom right to compare with the previous year. Data shows from the most recent date for which we have received samples.
  • This will be the final Aphid Monitoring Report of the 2021 season, although any further samples will still appear on the aphid monitoring website, so please keep checking it.
  • We would like to thank the AHDB for supporting the Aphid Monitoring Scheme over so many years, as well as all the participants who have managed to send us samples in every kind of weather! We hope to continue the scheme in some form, but for now we hope the information provided has been of use to you and wish you all a successful harvest.

Along with the results from your aphid trap you need to take into account the following factors when considering the risk of virus spread.