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with triazole uptake and trials with epoxiconazole demonstrated that plant uptake of the triazole was capped at 45 per cent with the addition of CTL,” Mr Bailey said. “With folpet, 25 hours after application, up to 70 per cent uptake was seen while the CTL mix remained capped at 45 per cent. “This increased uptake with folpet in the mix is very important in terms of improving the partner product’s curative performance,” stressed Mr Bailey. In the field, T2 trials in a (septoria) curative situation demonstrated that folpet (at 1-litre/ha) reduced the level of disease by nearly 30 per cent when mixed with Aviator (bixafen + prothioconazole), compared with when the SDHI was mixed with Bravo (at 1-litre/ha). Mr Bailey concluded by saying that, in addition to its performance enhancing capabilities against septoria, folpet also has a useful effect on yellow rust by increasing green leaf retention when applied in mixture with a triazole in sequence with an SDHI fungicide. In yellow rust

trials, this translated into a 0.79t/ha yield benefit over CTL.

Optimising OSR yield Adama technical specialist Kuldip Mudhar (left) posed the question as to what growers can do in the spring to optimise oilseed rape yield, outlining that disease control, canopy management and protecting the crop against pest attack were all key factors. Starting with disease (and light leaf spot in particular) he explained that while an autumn fungicide application was used as a protectant strategy, an early spring application was required as crops begin to “wake up”. “Growers need to know their varieties; those with more vigour in the autumn tend to get going quicker in the spring and while there are only two actives that give good control of light leaf spot, prothioconazole- and tebuconazole-based products, the latter, such as Orius P (tebuconazole + prochloraz), is a good PGR option for the spring.” Mr Mudhar suggested that AHDB trials had demonstrated clear benefits in reducing LLS infection by applying Orius P in a two-spray programme (autumn and spring), compared with a one-spray approach, while

also providing a yield increase in low disease pressure years. He did note, however, that for all products in AHDB LLS low disease pressure trials, there was no yield benefit from increasing dose rates above 50 per cent. Successful canopy management was dependent on the relationship between nitrogen and PGR use, he continued, and, depending on conditions over winter and levels of disease in the crop, he suggested that stem extension (20cm) is the ideal time for a PGR application to influence canopy size if disease pressure is low. “An application of Orius P at stem extension timing targets LLS and manages plant height. Once you get to 30cm, the internodal difference on the plant won’t be affected by the PGR,” explained Mr Mudhar. “That said, early detection and treatment of LLS in January or February will provide more effective

disease control than treating heavily diseased crops at stem extension. “A top-up LLS application can also be made at the green/yellow bud stage for further disease control and this will take out the apical dominance of the plant and increase branching,” he added. Mr Mudhar highlighted that the green/yellow bud stage was the last opportunity to control pollen beetle in crops – after that timing the beetle has a less damaging affect. “We’re seeing good kill of pollen beetle with Mavrik (tau-fluvalinate) at full field rate in a resistant situation. A further positive is that when Mavrick is sprayed during flowering for the control of cabbage seed weevil, it has less acute toxicity to honey bees compared with other pyrethroids. “Products should always be used in accordance with the label and best practice advice,” he stressed. *See page 20 for Adama’s options for weed control in spring cereals. ■

Adama resistant management strategies for septoria • Always start the programme with multisites • Maximise multisite use throughout the programme • Choice of multisite chemistry more important in curative situations • Limit SDHI sprays and dose • Use less triazole sprays but use robust doses in the SDHI mix at T1 and T2

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