1. To preserve yield - In trials an average of 4% of yield was lost to black-grass during January. Further losses follow, month on month. By February a further 5% is lost, in March yield potential is down by 11% and in April it’s closer to 17%. By applying Atlantis WG (mesosulfuron + iodosulfuron) at the earliest opportunity crops are protected sooner and yield potential is preserved.
% yield loss compared to the best yield in the trial data from multiple sites, years, black-grass levels & resistance status
2. Get better control - Earlier applications onto smaller, more vulnerable weeds give better, more reliable control. Black-grass plants continue to grow throughout the season, which means they are increasingly able to metabolise active substances, which means control from later applications is more variable. For optimal control, apply Atlantis WG as soon as conditions allow.
3. Reduce pressure on sprayers and operators and avoid tank-mixes - Early application of Atlantis WG preserves yield, optimises control and takes advantage of available sprayer and operator time. Competition for the sprayer hots up later in spring, with fungicides, PGRs and fertilisers all requiring application. Don’t be tempted to tank-mix Atlantis WG; it can compromise optimum control.
In trials the performance of a mesosulfuron and iodosulfuron formulation was tested in a wide variety of tank-mixes. Even those with minimal impact reduced control by 2-3%, this can make a big difference to the amount of seed returned when facing a significant population.
Data Source: BCS HD04GBRS05RB01 Lincolnshire. Sprays applied 16th April at Black-grass GS 30-39. % Reduction in Control assessed by Seedhead numbers 30th June. UNT 1954 Heads/m2
4. Wild oats can be taken out later - Where there is a broad weed spectrum it is worth evaluating which species is likely to have the biggest impact on yield. Often where black-grass is present, its prolific and competitive nature pushes it to the top of the priority list. Other later-germinating grass-weeds such as wild oats can be tackled later, being highly susceptible to fops and dens.
Delaying applications of Atlantis WG to control later-germinating weeds is a false economy and risks less than optimum black-grass control with additional costs in future years.
5. Open canopies make for easier applications - Black-grass has tall, thin, vertical leaves that make for a tricky target. As the season progresses, canopy cover can make applications even harder. Delaying applications jeopardises control: not only does black-grass improve its ability to metabolise active substances, but the denser crop canopy makes an accurate application harder still.