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Plenum sprays on target to control aphids in oilseed rape


United Kingdom
October 9, 2014

Good growth of oilseed rape crops over recent weeks now gives growers a better chance to target PLENUM spray applications to control aphids that risk spreading TuYV.

Winged MyzusPopulations of Myzus Persicae (Peach Potato Aphid) are now widespread in oilseed rape crops, with research showing up to 70% could be carrying Turnip Yellows Virus (TuYV). National monitoring has shown the number of migrating winged aphids has continued to increase.

Syngenta application specialist, Ben Magri, highlighted that with many crops now at the four to five leaf growth stage, spray treatments can be better targeted to hit the leaf surface. With the waxy surface of young plants, lower water volumes have proven most successful in retaining spray on the target.  Ben Magri

“For optimum results with PLENUM we would advocate the use of angled nozzles and spraying at a water volume of 100 l/ha,” he advised. “Furthermore, our trials have shown the addition of a high quality methylated rapeseed oil in the tank mix can aid leaf coverage and spray retention on the surface.

“Where an agronomists’ advice calls for the inclusion of methylated rapeseed oil, make sure it’s added at the right concentration for the water volume.  The correct adjuvants can be an important part of recommendations and can boost the amount of product sticking to leaves and pests.”

Results of independent trials by Dr Alan Dewar, to assess control of Myzus and reduce the spread of TuYV, have reinforced the use of oil, and shown PLENUM as the most effective available option for growers.
   
Dr Dewar’s trials showed PLENUM with oil achieved the best results, with 83% control of Myzus five days after application, compared to less than 70% with thiacloprid and just 61% with flonicamid.

OSR leaf surfacePLENUM is especially valuable for autumn aphid control in OSR, since virtually all Myzus tested have proven resistant to the pyrethroid insecticides used in the past. Current advice is to treat as soon as Myzus are found in the crop, to reduce the risk of virus being spread. PLENUM will provide up to two weeks control of further aphids migrating into the crop. 

TuYV has been attributed as one of the major reasons that oilseed rape crops fail to reach their true potential.  Without treatment, the HGCA has calculated annual yield losses from TuYV could be over 200,000 tonnes, costing the industry approximately £50m* a year, equating to nearly 10% of the total crop value.

*Recalculated to Sept 2014 crop value (£240/t); actual report £69m (£345/t)



More solutions from: Syngenta Crop Protection UK Ltd


Website: http://www.syngenta-crop.co.uk/

Published: October 9, 2014

 

 

 

 

 

 

 

 

 

 

 


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