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AR83685: What you need to know

  • AR83685 is a liquid formulation with a low application volume
  • AR83685 is not a match for granular nematicides where the PCN pressure is high
  • In low to moderate PCN situations it can deliver similar marketable yield increases as full-rate Vydate
  • The application method and timing of application is flexible with both the overall spray followed by incorporation and in-furrow applications giving similar performance in most situations
  • AR83685 provides similar reductions in egg and cyst multiplication as granular nematicides Vydate and Nemathorin
  • From initial work, the formulation does not lead to any additional negative crop effects when applied in-furrow with Amistar
  • AR83685 performs similarly to Vydate and close to that of Nemathorin in FLN situations

Trials investigating the performance of Bayer’s new SDHI-based nematicide, AR83685 (now available as Velum Prime), suggest it gives control of potato cyst nematodes (PCN) equivalent to granular nematicides in low to moderate pressure situations.

Delivering a trials update on the new product at the Bayer Potato Conference in January, Andrew Flind, development manager, explained that trials in 2017 season had sought to consider AR83685’s performance under less-than-high-pressure-situations.

“In lower pressure situations, AR83685 performed well, delivering an improvement in marketable yield with no significant difference between application methods or timings. On its own, AR83685 performed close to full-rate Vydate,” said Mr Flind.

The trials investigated application timing (zero to seven days before planting) and method (either in-furrow or overall spray with incorporation at bed forming) while other work considered its performance in sequence with other commercially available granular nematicides for control of both potato cyst nematodes (PCN) and free-living nematodes (FLN) and crop safety when applied with Amistar (azoxystrobin).

“At the high-pressure site in Scotland, the in-furrow application method out-performed that of overall spray which suggests that there was some benefit to targeting its application to the area immediately around the tuber.

“In the more moderate situations, however, there was no significant difference between in-furrow or overall spray. This suggests it will appeal to a range of application situations,” he said.

“We also observed no additional adverse effects of applying in conjunction with Amistar in-furrow. Where the pressure was lower, we saw a small reduction in yield with Amistar compared with where AR83685 was applied alone.”

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