Press Release •  26/04/2022

Dry spell may alter potato growers’ herbicide strategies this spring

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Corteva Agriscience Field Technical Manager Craig Chisholm says leaving weeds unchecked can reduce yield, slow down harvesting machinery and increase the risk of blight. 

“Dry soils can crack or slip down the ridges, disrupting the all-important seal required for optimum efficacy from pre-emergence herbicides. As a result, rain or planned irrigation in the next few weeks will stimulate weed growth from the ridge surface and from depth,” Craig says. 

“Dry conditions in unirrigated fields, and disruption to the herbicide ‘barrier’, means that the efficacy of pre-emergence chemistry will be compromised. This could well be a year when growers need to think about following up with a post-emergence spray.” 

Titus®, containing the active ingredient rimsulfuron, is a valuable post-emergence herbicide which targets key problem weeds and is an invaluable tool in a dry season when pre-emergence activity will be negatively affected.

The selective herbicide has been a mainstay of potato growers’ early-season programmes to control a wide range of broadleaf weeds including cleavers, chickweed, redshank, mayweed and oilseed rape volunteers.

Titus has also demonstrated excellent activity on a range of grasses, notably couch.

“The qualities of Titus are well known to UK and Irish potato growers and agronomists and with fewer options available for weed control, it will become an ever-more important tool,” says Craig.

“Titus should be applied when broad-leaved weeds are small and actively growing, typically cotyledon to four leaves, and grasses pre-tillering (two-to-three leaves), and before crop sheltering can impact herbicide coverage.

“It is suitable for use on all potato varieties excluding seed crops and is compatible with metribuzin, which will further broaden the weed spectrum in potato varieties which are tolerant to post-emergence application.”

Titus should be applied at 50g/ha when applied alone or 40-50g/ha in mix with metribuzin, and always used with an approved adjuvant.

For more information visit the Titus product page here.

Useful information

  • Media contact: Ben Pike,
    Tel: 01327 438617
  • Titus product page
  • Watch our #FollowTheCrop video for the 2021 season looking at potato management operations 3 weeks into the season with a slow start for much of the UK crop