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This site is funded by the Potato Council, designed and hosted by Fera.

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Historical Data
Average Weekly Index

View a summary of 2012. Compare years

Aphid trapping has now finished, with a total of 908 samples received in 2012.

New sites/regions will appear on this map as we get the grid references of the sites

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1. Weekly Summary
2. 1st peach-potato aphid
3. High weekly indices

This page defaults to the data from the most recent sample, however, you can adjust the year and date to change the results on the map.

Year: Date:

Based on industry feedback in 2006, the opportunity to make comparisons with historical data has been provided.

  • Choosing "Average Weekly Index" in the Date box above shows the average weekly index for each trap
  • Choosing a date shows the index for the most recent sample from each site as long as it has been taken in the 10 days before the date
Key: Weekly index value
0.0 - 2.0     If a regions bounding box is coloured red, then at least one Peach-Potato aphid has been captured in the last 10 days in that region

If there is a date to the left of a region, this is the date the first peach-potato aphid was captured in that region.
2.01 - 10.0
>10.0
No Sample received

Please click on a boxed region or use the links below to get more detailed results and cumulative index values

North Scotland Angus & Perthshire
Borders Northern England
Midlands East Anglia
South-West Grampian

Along with the risk index you need to take into account the following factors when considering the risk of virus spread.

  • Mature plant resistance. Crops are generally at their most vulnerable within the first four weeks from emergence. After this time 'Mature Plant Resistance' builds up which makes it more difficult to transmit virus within the crop.
  • Cultivar resistance. Different varieties of seed will have different inherent natural resistance to PVY. Using a more resistant cultivar will reduce the risk of virus transmission.
  • Volunteers and seed quality. In most situations it is unlikely that aphids will bring PVY into your crop (see next note). The greatest risk is from aphids spreading what little virus may already be present. This can come from two possible sources. Volunteers from previous potato crops and low levels of virus in the seed planted.
  • Surrounding crops. The risk of aphids spreading PVY to your crop from elsewhere is increased when ware crops are grown close to your seed. This is because there will be greater numbers of aphids and ware crops generally have a higher incidence of virus present.