Arable ‘Boom and bust’ warning


over septoria resistance • Higher levels of disease reported • Varieties have Cougar parentage • Growers urged to monitor crops


cientists are analysing re- ports of higher than expect- ed septoria levels affecting winter wheat varieties with the common parent Cougar. Some winter wheat varieties in trials overseen by the Agricul- ture and Horticulture Develop- ment Board appear to show high- er levels of septoria than would be expected from disease ratings published in the 2021/22 Recom- mended Lists.


S


AHDB list manager Paul Gosling said: “Our trial inspec- tors have observed that some soft wheat varieties have unexpected-


ly high levels of septoria tritici – certainly more than the current RL disease ratings would other- wise suggest.”


Tremendous variability Mr Gosling said it was not easy to say which varieties were affected until disease data had been val- idated. As a precaution, growers


Growers should monitor disease on all varieties


“


should monitor disease levels on all varieties carefully, he added. Varieties with Cougar as a parent are LG Prince, LG Illu- minate, LG Quasar, KWS Fire- fl ay, Merit, LG Astronomer, RGT Saki and Swallow. All are Group 3 wheats apart from Saki and Swal- low which are Group 4 (soft). “Across trials, there is tremen- dous variability,” said Mr Gosling. “This will need to be statistically analysed before conclusions are reached.”


Cougar was added to the Rec- ommended Lists in 2013, with a septoria tritici disease resistance rating of 7. It stood apart from the majority of varieties that had moderate levels of resistance (rat- ings of 5 or 6).


It showed high levels of resist- ance until 2015, when moderate


LOWER OAKLEY, DISS, NORFOLK IP21 4AQ


Grain Handling & Milling Systems


• Manufacturers of steel framed building, grain stores, livestock buildings general purpose building and commercial building


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Tel: 01692 535444 / 07717 478196 E: andrew@mconstructionservices.co.uk


W: www.mconstructionservices.co.uk 12 ANGLIA FARMER • AUGUST 2021


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