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Top Questions to our Technical Helpline - February 2013

Ian Cockram

Over the past few months the technical helpline has been especially quiet due to the adverse weather stopping all activity on the land. However judging by the few calls received over the past couple of weeks, farmers and advisers are thinking about grass weed control programmes for their wheat crops. One recurring question is : Should Atlantis WG (iodosulfuron + mesosulfuron) be applied with a residual herbicide ?

Where crops did not receive an Autumn herbicide or where further emergence of grass weeds are anticipated then Atlantis WG can be tank-mixed with Liberator (diflufenican + flufenacet) at a rate of 0.3 L/ha. Liberator recently received a new approval for use up until the end of March. This could be especially relevant this year with many late drilled and open crops, where further weed emergence is perhaps more likely than usual.

The other area of interest is disease control programmes for oilseed rape. Due to the waterlogged conditions many OSR crops did not receive an Autumn Phoma application. However the focus of attention now shifts to Spring fungicide options. Where crops did not receive an Autumn fungicide it could be appropriate to consider an early application of Folicur (tebuconazole) 0.75 – 1 L/ha at green to yellow bud stage for light leaf spot control with plant growth regulation as a useful side effect in more forward crops. Proline 275 is best applied at early to mid flower for combined light leaf spot and Sclerotinia control..