Frequently Asked Questions

These are a selection of the most frequently asked questions regarding the aphid monitoring service and how to use the results it provides. If your query is not answered on this page, then please submit your question and contact details below. We will answer your query as promptly as possible.

Q. Why should I be interested in what species of aphids are arriving in my crop?
A. Not all aphids species transmit virus to your crop and those that do transmit do so with varying levels of efficiency. Some vector species will colonise potatoes however, many will simply move on as potatoes are not a suitable food source. By identifying the species of aphids arriving we can provide information on whether your crop is at risk from virus spread and colonisation.

Q. When are my crops at their most vulnerable to virus transmission?
A. Crops are at their most vulnerable at emergence. After about four weeks the plants begin to display what is called 'Mature Plant Resistance'. This makes virus transmission more difficult and this resistance increases as the plant gets older. However, this resistance does not mean the transmission will not occur, just that it is less likely. The crop is again more vulnerable to virus spread if there is regrowth after dessication.

Q. Does the variety of seed used make any difference to virus transmission?
A. Some cultivars have more natural virus resistance than others. Growing one of the more resistant seed varieties would reduce the risk of virus transmission.

Q. Do surrounding crops make a difference to the risk of virus spread?
A. Due to the non-persistent nature of PVY, it is unlikely that aphids will bring the virus into your crop. This small risk is increased however if you have ware crops close to your seed crops. Ware crops generally have a higher incidence of PVY present and it is possible for aphids to transmit this to nearby seed crops.

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