A return to more settled weather has allowed many growers to catch-up with delayed T1 spraying schedules and others to progress with T2s, according to FWi’s team of agronomists this week (w/c 5 May 2008).
Andrew Blazey said spraying opportunities in the east had been few and far between due to unsettled weather in April, proving the value of T0 sprays in keeping disease at bay.
Yellow rust in susceptible varieties had dried up, but warm weather following last month’s rain could increase septoria pressure, he said. “If any T1’s are still outstanding make sure doses are robust enough to get eradicant activity.
“At the time of writing leaf two is just popping out on many crops and we will be turning around and doing it all again as flag approaches. Plan to begin flag leaf sprays from growth stage 37 onwards, even if T1’s were only recently done.”
Wheat growth stages in Devon were “all over the place” Neil Potts said. The most backward were still at mid-tillering, while forward Einstein had reached GS 39 and would receive a T2 fungicide this week.
“The bulk of crops have flag leaf just visible. Septoria is the main disease we’ll be focussing on – Einstein in particular looks pretty dirty in the bottom of the canopy.”
In Northumberland, David Cairns said leaf emergence was about a fortnight behind last year after “one of the bleakest and slowest April’s I can remember.”
Most wheat crops had leaf three fully-emerged and robust T1 fungicides had been applied, he said. “I think disease pressure is high and will become more visible on unprotected crops.”
Tod Hunnisett in Hampshire said most wheat crops had just received a T1 fungicide and the flag leaf had just appeared on the most forward crops. Septoria risk remained very high, he added.