Arable


nusual spring weather means growers should consider using an SDHI fungicide in the T3 timing slot to control late foliar dis- ease in wheat, say agronomists. The T1 and T2 timings are the nat- ural home of SDHI fungicides. But Pat- rick Stephenson of the Association of Independent Crop Consultants says there is a case for them at T3 follow- ing another challenging spring. The big unknown is the weather,


says Mr Stephenson. In a normal sea- son, that wouldn’t be such a problem. But many T1 and T2 sprays went on early this year with T0 sprays omit- ted or also applied early to tackle yel- low rust.


Foliar disease “An SDHI is going to give a boost to Septoria and rust control over straight azole. If only one SDHI has been used in the programme it is an option if late foliar disease is fuelled by warm and wet weather.” In early 2012, for example, it was so dry that hosepipe restrictions im-


An SDHI at T3 timing could pay dividends U


Grain quality


“If you’re growing a variety like Skyfall then grain quality is a criteria. Shrive- led grain or dull samples may not im- pair yield greatly but can hit quality.” This is when including an SDHI


posed in some areas. Septoria pressure was extremely light ahead of GS32 (T1) but disease pressure increased rapidly when prolonged wet weather arrived.


Including an SDHI also helps manage the fusarium threat


also fi ts the fusarium threat, as many have a prothioconazole base, adds Mr Stephenson. Trials have highlighted that an SDHI can be worth as much as 0.45t/ha for every day green leaf area is main- tained in the upper canopy post GS39 in some seasons, according to James Wilkins of Bayer. Mr Wilkins says: “Aviator (prothio- conazole + bixafen) delivers a suffi - cient dose of prothioconazole to man- age fusarium – plus you’re getting enhanced foliar control and greening benefi ts from bixafen.”


Other factors also come into con- sideration suggests Mr Stephenson. With crops looking promising and respectable grain prices, a small yield increase is only required to pay for the premium over straight azole.


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