Summary information for 04-08-2017 through to 10-08-2017

Sample data for 04-08-2017 through to 10-08-2017

Region Samples Mean PVY Index per Sample Mean Colonising Aphids per Sample Mean Aphids per Sample Total aphid species
North Scotland 6 1.08 0.67 2.67 6
Grampian 11 0.65 0.73 1.45 7
Angus & Perthshire 7 0.83 1.86 3.86 7
Northern England 2 0.05 0.00 1.00 2
East Anglia 1 0.00 0.00 0.00 0
TOTAL 27 0.73 0.93 2.26 14

Sample data for 2017

Region Samples Mean PVY Index per Sample Mean Colonising Aphids per Sample Mean Aphids per Sample Total aphid species
North Scotland 106 6.35 6.43 17.87 46
Grampian 135 3.76 4.00 7.62 52
Angus & Perthshire 97 3.18 3.29 5.46 47
Borders 48 2.27 2.29 5.35 34
Northern England 119 45.84 37.89 75.62 61
Midlands 50 50.78 38.66 121.94 60
East Anglia 131 6.92 5.16 19.56 60
South-West 91 20.70 16.85 48.88 56
TOTAL 777 15.94 13.26 33.23 96

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

Summary information as of 10-08-2017

  • North of Scotland (6 samples), Grampian (11 samples), Angus & Perthshire (5 samples), Northern England (1 sample) - Low Risk

    • Virus pressure was lower than the average for the last 13 years in all regions.
    • Peach-potato aphids have been found in low numbers in samples from the North of Scotland, Grampian and Angus and Perthshire regions. Numbers of this species were higher than the average for the time of year in Grampian and Angus and Perthshire.
    • Potato aphids have been found in low numbers in samples from Grampian.
    • Another potato colonising species, the bulb and potato aphid, was found at one site in the Grampian region. This species can transmit potato viruses in stored potatoes.
    • Numbers of all other potato virus vectors were lower than the average for previous survey years.
    • Black-bean aphids (a good vector of PVA) were found in low numbers in samples from: the North of Scotland, Angus and Perthshire and Northern England.
    • No samples were received from the Borders, the Midlands, East Anglia or the South West in the last week.
    • 778 samples have been received so far this year.

    • North of Scotland: Virus pressure was low and only 20% of the average for the time of year. Peach-potato aphids were found at 3 sites buit in much lower numbers than average for the time of year. No potato aphids were found. Other potato virus vectors found: bird-cherry oat aphid, black-bean aphid, grain aphid, rose-grain aphid.
    • Grampian: Virus pressure was low and only 30% of the average for the time of year. Peach-potato aphids were found at 3 sites and numbers increased again to 25% above the average for the time of year. A single potato aphid was found. Another potato colonising species, the bulb and potato aphid, was found at one site. Other potato virus vectors found: black-bean aphid, rose-grain aphid.
    • Angus and Perthshire: Virus pressure was low and only 10% of the average for the time of year. Peach potato aphids were found at 1 site. No potato aphids were found. No other potato virus vectors were found.
    • Borders: No samples were received in the last week.
    • Northern England: Virus pressure was very low and only 3% of the average for the time of year. No peach potato aphids or potato aphids were found. Other potato virus vectors found: black-bean aphid.
    • Midlands: No samples were received in the last week.
    • East Anglia: No samples were received in the last week.
    • South West: No samples were received in the last week.

    • Virus pressure was low, and much lower than the average for the time of year, across all regions in the last week. Numbers of all vector species are decreasing, except peach-potato aphid in Grampian and Angus and Perthshire.
    • Harvest is underway and monitoring is ending in more southerly regions of GB so monitoring has ended in some regions.
    • The black-bean aphid (Aphis fabae) has been found to transmit PVA so if you are growing PVA susceptible varieties (Desiree, King Edward, Maris Peer, Marfona etc) you may wish to take this into account.
    • Cereal aphids in the last week: Grain aphids have been found in samples from the North of Scotland in low numbers (only 30% of what would be expected based on catches from previous years; Rose-grain aphids have been found in samples from the North of Scotland and Grampian in low numbers - only 10% of the average for all previous survey years; Bird cherry-oat aphids have been found in samples from the North of Scotland over the last week (numbers 50% down on the average for previous years).

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