Action to stop TuYV
Hot dry weather has been over spring and early summer has been highly favourable for aphid pest populations, with numbers of Myzus persicae aphids being caught in most monitoring traps running higher than this time last year. Myzus is considered the key vector of TuYV in oilseed rape.
Furthermore, AHDB testing results of Myzus populations this year has already revealed two-thirds of early season populations were already carrying TuYV and capable of transmitting infection.
Syngenta insecticide specialist, Max Newbert, warned that early autumn transmission of infection into oilseed rape plants is likely to result in greater susceptibility to stress and more severe yield loss. Early infection also increases the chance of secondary spread through the season.
“With more farmers delaying drilling and encouraging green stubbles to control black-grass, there is a higher risk of infection being spread to oilseed rape; Mayweed, Chickweed and Groudsel are all well-proven hosts for TuYV,” he added.
The threat potential has heightened by widespread resistance to pyrethroid sprays among Myzus populations.
“It’s reached such a high level pyrethroid applications will not offer any substantial control. Growers should now opt for Plenum as a means for control,” Max advocated.
“Independent research has demonstrated that Plenum was the most effective in preventing the spread of TuYV in autumn oilseed rape crops.”
For more information and iOSR growers' experiences, visit the Arable Farming iOSR website: