Potato growers advised to up their dose of weed killer Retro in dry weather conditions

The prospect of limited rain showers this week (26 - 29 April) will trigger a surge of weed activity that could further delay potato crop growth, experts have warned.

Potatoes starting to emerge. Image: Syngenta
Potatoes starting to emerge. Image: Syngenta

Many potato crops are now emerging alongside intense weed competition - with the continued dry weather conditions significantly reducing the efficacy of all residual herbicide treatments.

Syngenta potato manager Tom Whitworth is therefore advising growers to use the higher available rates of Retro, at up to 4.0 l/ha, to help them remove the larger and more aggressive weeds.  

He said: "The higher rate of Retro will give faster and more robust kill of larger weeds. Cooler temperatures this week will give ideal conditions for Retro application and leave a clean seedbed for rapid crop growth."

He also reminded growers that Retro is the only diquat herbicide approved for use at up to 4.0 l/ha; other diquat products may only be used at a 50% lower 2.0 l/ha label approved rate.

Retro can be used on maincrop potatoes with up to 40% emergence, or 10% emergence of early varieties. 

He said: "The higher rate will also be crucial for later planted crops where growers have waited until as close to emergence as possible before applying their Defy residual herbicide, when there may already be significant weed populations established."

Trials have  shown Defy + Retro tank mix can be safely used up to 10% crop emergence, ensuring the crop can get away in a clean weed free seedbed with the longest possible residual activity.

Have you registered with us yet?

Register now to enjoy more articles and free email bulletins

Sign up now
Already registered?
Sign in

Before commenting please read our rules for commenting on articles.

If you see a comment you find offensive, you can flag it as inappropriate. In the top right-hand corner of an individual comment, you will see 'flag as inappropriate'. Clicking this prompts us to review the comment. For further information see our rules for commenting on articles.

comments powered by Disqus

Read These Next

What challenges and opportunities lie in store for tomato growers?

What challenges and opportunities lie in store for tomato growers?

The British Tomato Growers Association (TGA) conference today (21 September) heard a range of perspectives on what changes lie in store for the sector and how to anticipate them.

Buoyant demand for UK apples but frost and labour remain concerns

Buoyant demand for UK apples but frost and labour remain concerns

As the British apple season begins, English Apples & Pears (EAP) is warning that growers will feel the effects of both a late frost in spring and also constrained labour supply.

Tomorrow's tractors

Tomorrow's tractors

These machines have advanced rapidly over recent years but what does the future hold? Sally Drury looks ahead.

Follow us on:
  • Facebook
  • LinkedIn
  • Twitter
  • Google +
Horticulture Jobs
More Horticulture Jobs

Pest & Disease Tracker bulletin 

The latest pest and disease alerts, how to treat them, plus EAMU updates, sent direct to your inbox.

Sign up here

Professor Geoffrey Dixon

GreenGene International chair Geoff Dixon on the business of fresh produce production

Read Professor Geoffrey Dixon