Addressing the increasing virus problem faced by seed potato growers may call for a re-think on how drills are planned and the implementation of effective IPM strategies to help combat the risk of virus-vectoring aphids developing insecticide resistance.
Potato Review reports on innovative research, led by Eric Anderson of Scottish Agronomy, which has shown sowing spring barley around headlands and wildflowers along tramlines of seed potato fields can help to reduce virus incidence.
Eric said: “Virus health is one of the industry’s most important challenges. The main culprit is PVY, principally the PVYN strain, but PLRV has also increased albeit from a very low base. There are concerns that visual observation is becoming a less reliable method of assessing plant health. PVYN may easily go undetected, partly because less aggressive PVYN recombinants might have been selected for by the action of roguing out PVYO with obvious field symptoms.”
Once aphids are in the crop, reliance on a single mode of action and widespread use of pyrethroids risks elevating selection pressure for resistance, Eric warns. In addition, research conducted in Ireland led by Teagasc research officer Dr Lael Walsh have found sensitivity shift to pyrethroids in the bird cherry oat aphid.
Source: Potato Review. Read the full article here