Midlands (2 samples), East Anglia (2 samples) - Low Risk
Northern England (2 samples) - Moderate Risk
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No samples were returned from Scotland this week.
Trapping has almost finished across England.
Samples were returned from only 3 regions in the last week: Northern England, Midlands and East Anglia.
2 Peach-Potato aphids were found in a sample from Northern England; no Potato Aphids were found in any region.
Black-Bean aphids (a good vector of PVA) continued to be found from one site in Midlands.
1 Grain aphid was found in a sample from Northern England.
818 samples have been received so far this year.
North of Scotland: No samples were received.
Grampian: No samples were received.
Angus and Perthshire:No samples were received.
Borders: No samples were received.
Northern England: 2 samples were received. 2 Peach Potato aphids were found. Other virus vectors found: Grain aphid, Black Bean aphid.
Midlands: 2 samples were received. No Peach Potato aphids or Potato aphids were found. Other virus vectors found: Cabbage aphid.
East Anglia: 2 samples were received. No Peach Potato aphids or Potato aphids were found. Other virus vectors found: none.
South-West: No samples were received.
Most growers across GB have now stopped monitoring and we are seeing very few aphids in the samples we are receiving. Please disregard the weekly summary tables above, as due to technical difficulties the latest samples have not displayed. However the Overall Summary Table is correct. Sample data will continue to be added to the website, but this will be the last Aphid Monitoring Report for this season.
Along with the results from your aphid trap 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. The crop is
again more vulnerable to virus spread if there is regrowth after dessication.
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
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.