A novel spray nozzle which offers a much-needed solution to help
growers get around this season’s larger cereal areas faster,
to protect them against diseases on time, is being made available
from Syngenta, to help make the most of better grain prices by
minimising yield losses from delayed spraying.
Tom Robinson with new 'Go Faster' Amistar Nozzle (brown) and traditional
Amistar Nozzle (blue)
Developed specifically for applying the systemic strobilurin-containing
fungicides Amistar and Amistar Opti, when used at appropriate doses,
the new ‘Go Faster’ Amistar Nozzle builds on the advantages
of the existing Amistar Nozzle, says Syngenta application specialist
Tom Robinson – including reduced drift, plus suitability
for 100 l/ha or 125 l/ha spray volumes for improved work rates
versus traditional 200 l/ha spraying.
More importantly, however, it also allows spraying at a faster
forward speed of up to 17 kilometres per hour in suitable conditions,
compared with the optimum 12 km/h for the existing 025 Amistar
That increase could be enough to treat 40% more hectares of wheat
per day than a conventional nozzle spraying at 200 l/ha and 12
km/h, he calculates.
For 100 ha of wheat at £150/t, if it prevents the yield loss
associated with a week’s delay in flag leaf spraying, it
could mean almost an extra £7,500 profit for the grower,
“We know T2 is the most important fungicide timing in wheat,” explains
Mr Robinson, “because the flag leaf which it’s designed
to protect can contribute over 40% to yield. Indeed, just one day’s
delay can result in a 70 kg/ha yield loss – equivalent to
nearly half a tonne per week.
“Against this, however, growers face around 12% more wheat
to protect at T2 this year compared with last season, due to increased
plantings. So the ability to get around quickly is even more crucial – especially
since spray days at the May T2 timing are often limited.
“These challenges are in addition to the usual ones of multiple
disease threats, such as Septoria tritici and rust on susceptible
varieties, and the need for persistent protection – all of
which make a strobilurin + Bravo + triazole mixture an ideal fungicide
“Amistar and Amistar Opti not only provide extended protection
against a range of diseases, but they’re also versatile when
it comes to application – with trial plots showing Amistar
maintained better control of brown rust when water volume was reduced
below 200 l/ha compared with a less mobile strobilurin.
“The existing Amistar Nozzle has already proven itself for
100 l/ha spraying, which is a useful first step for efficient spraying.
“Now, the new ‘Go Faster’ Amistar Nozzle allows
the 12 km/h forward speed of the existing version to be increased
up to 17 km/h in suitable conditions – to help protect even
more hectares on time.
“The combination of Amistar or Amistar Opti plus triazole
and the new ‘Go Faster’ Nozzle is an ideal option for
protecting larger wheat and barley areas this season. Indeed, in
trial plots last season, adding Amistar Opti to triazole at T2
boosted yield by 0.8 t/ha.
“Also, if growers use Amistar Opti they could save time in
another way, because it contains the Bravo element against Septoria
tritici and the Amistar element already formulated together. So
it cuts down on the number of packs for mixing and rinsing while
filling the sprayer.
Looking at the mechanics of the new nozzle in more detail, Mr Robinson
says central to its ability to operate at faster speeds is a larger
spray orifice coupled with a specially-developed, novel spray angle.
Typically when spraying faster, he says growers simply use nozzles
with a larger orifice to maintain the same spray output per hectare.
In line with this, the new Go Faster Amistar Nozzle has a larger
orifice – classified as an 035 flat fan compared with an
025 for the traditional Amistar Nozzle. However, following testing
at Silsoe Research Institute looking at how to maintain even target
coverage with faster spraying, the new nozzle also features a novel
13 degree rearward facing spray angle.
This essentially compensates for the faster forward movement of
the sprayer over the crop to give more even dosing on both sides
of the spray target, says Mr Robinson – versus a vertical
spray which has been found to deposit more spray on the leading
side which the sprayer reaches first. It compares with a smaller
10 degree rearward angle for the existing Amistar Nozzle for 12
“We examined a range of spray angles and 13 degrees was optimum
for the faster speed. Like the traditional Amistar Nozzle, the
new Go Faster Nozzle also uses air induction principles to reduce
drift and for better droplet retention due to less bounce-back
“It also combines this with a variable pressure tip which
keeps the fan pattern intact even if spray pressure is reduced
to one bar – for example if the sprayer slows down going
up hill, or the operator wishes to further reduce drift when spraying
near field margins.
“All in all, with bigger cereal areas to spray, it should
go hand-in-hand with Amistar and Amistar Opti to help growers achieve
even more from the better grain prices this year.”
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