The impending withdrawal of Deter (clothianidin), from 19 December, could have a big impact on the industry, said Agrii’s David Leaper at the company’s open day.
Introduced 10 years ago, originally to guard against BYDV, the seed dressing really took off on the strength of its slug deterrent properties in the light of tighter restrictions on slug pellet use, he said.
“It does mean that we are very exposed [to BYDV] particularly on winter barley which is very prone to the disease.”
There is some genetic tolerance to the virus in the six-row varieties Amistar and Rafaela, he noted. “And it’s only a matter of time before it comes into two-rows. But in the short term farms are exposed.”
There is new anti-BYDV chemistry in the pipeline which works in a similar way to Deter, he noted. “But because its mode of action is different it may not have the same slug effect. And it may control the aphids, but it may not control the virus.”