May 01 2020

Hit your goal, gain control of weeds in Maize

Optimise weed control with Sorrento

With maize drilling well underway, keeping the crop free from early weed competition will be crucial to protect yield in the first month or so after emergence. However, with the narrowing of rotations increasing the threat from troublesome weeds such as cleavers, fat-hen and sowthistles, and the dry spell forcing some growers to opt for a post-emergence only weed control programme, optimising herbicide performance will be essential to protect yield and cob quality. With already proven results in maize, new adjuvant Sorrento could be particularly useful this spring to help keep crops weed free.

Hit your goal, gain control of weeds in Maize

 

Why herbicide performance can be improved

Despite the large nature of the maize crop, care and attention is required to keep weeds out in order to encourage the establishment of a strong healthy plant that is fit and able to make the maximum use of available sunlight, moisture and nutrients. Weed competition not only leads to weak, shallow rooted plants susceptible to lodging, it also can result in stressed crops and a yield penalty, with inconsistent cob size and fewer kernels. However, treating weeds post-emergence is not without its challenges. 

Poor coverage, poor uptake

As maize plants increase in size, the delivery of post-emergence herbicides to target weeds becomes more tricky. Weeds can become shaded and herbicide intercepted by the crop, leading to poor coverage and a significant reduction in the control of target weeds – also now larger and more difficult to control by this stage. Weed control can also be particularly challenging with spring germinating weeds such as fat-hen and sowthistle that have hairy/waxy leaves which prevent the herbicide:leaf contact required for good coverage across the leaf (due to poor spreading) and penetration through the leaf cuticle. With the resulting poor coverage and uptake into weeds, a significant reduction in weed control can be a real threat to the crop.

How Sorrento can help 

New adjuvant Sorrento is perfectly suited to help post-emergence herbicides overcome the challenging application conditions in maize, leading to faster uptake and higher overall weed control. 

Improved coverage, faster uptake

Sorrento

Sorrento demonstrates excellent spreading properties which will help to ensure good coverage on more established weeds and those that are particularly waxy/hairy such as fat-hen and thistles. Sorrento also helps fast penetration into weeds, resulting in faster and more effective weed control. One of the most noticeable benefits of Sorrento is the speed at which it works, with significant improvements in speed of kill seen in trials even by the first assessment.

Proven to increase efficacy and yield in Maize

The addition of Sorrento to post-emergence herbicides can lead to significant improvements in weed control and yield. Trials conducted with nicosulfuron have shown significant improvements against a number of key weed species and up to a 5 t/ha yield benefit.

Efficacy and yield benefits with nicosulfuron

First assessment - Sorrento increased ½ rate nicosulfuron control significantly against the key weeds

13 Days after application

2017. Maize cv P8201. Treatments applied on 1st June 2017 in ideal conditions at crop GS14. Weed populations in untreated at application: Couch – 59 plants per sqm; Gallant Soldier – 8 plants per sqm; Perennial Sowthistle – 55 plants per sqm; Creeping Thistle – 5 plants per sqm; Fat Hen – 25 plants per sqm; Corn Spurry – 18 plants per sqm

Final assessment – Sorrento had improved control of all weeds, some significantly

110 Days after application

Maize cv P8201. Treatments applied on 1st June 2017 in ideal conditions at crop GS14. Weed populations in untreated at application: Couch – 59 plants per sqm; Gallant Soldier – 8 plants per sqm; Perennial Sowthistle – 55 plants per sqm; Creeping Thistle – 5 plants per sqm; Fat Hen – 25 plants per sqm; Corn Spurry – 18 plants per sqm

First assessment - At ¾ rate nicosulfuron, Sorrento still improved control of all key weeds

13 Days after application

Maize cv P8201. Treatments applied on 1st June 2017 in ideal conditions at crop GS14. Weed populations in untreated at application: Couch – 59 plants per sqm; Gallant Soldier – 8 plants per sqm; Perennial Sowthistle – 55 plants per sqm; Creeping Thistle – 5 plants per sqm; Fat Hen – 25 plants per sqm; Corn Spurry – 18 plants per sqm

Final assessment - Benefits of Sorrento evident, particularly hard to control weeds

110 Days after application

Maize cv P8201. Treatments applied on 1st June 2017 in ideal conditions at crop GS14. Weed populations in untreated at application: Couch – 59 plants per sqm; Gallant Soldier – 8 plants per sqm; Perennial Sowthistle – 55 plants per sqm; Creeping Thistle – 5 plants per sqm; Fat Hen – 25 plants per sqm; Corn Spurry – 18 plants per sqm

First assessment - With full rate nicosulfuron, Sorrento boosted weed control even further

13 Days after application

Maize cv P8201. Treatments applied on 1st June 2017 in ideal conditions at crop GS14. Weed populations in untreated at application: Couch – 59 plants per sqm; Gallant Soldier – 8 plants per sqm; Perennial Sowthistle – 55 plants per sqm; Creeping Thistle – 5 plants per sqm; Fat Hen – 25 plants per sqm; Corn Spurry – 18 plants per sqm

Final assessment – Sorrento had optimized control of all key weeds

110 Days after application

2017. Maize cv P8201. Treatments applied on 1st June 2017 in ideal conditions at crop GS14. Weed populations in untreated at application: Couch – 59 plants per sqm; Gallant Soldier – 8 plants per sqm; Perennial Sowthistle – 55 plants per sqm; Creeping Thistle – 5 plants per sqm; Fat Hen – 25 plants per sqm; Corn Spurry – 18 plants per sqm

Weed control benefits from addition of Sorrento were reflected in yield with a 5 t/ha yield benefit even with full rate nicosulfuron

Effect of Sorrento with nicosulfuron on whole crop yield (t/ha) in Maize

2017. Maize cv P8201. Treatments applied on 1st June 2017 in ideal conditions at crop GS14. Crop harvested on 20th September 2017.

Sorrento added significant benefits to nicosulfuron in further trials

Sorrento improved weed control significantly at all rates

Effect of Sorrento with nicosulfuron on weed control in Maize. Final assessment - 127 days after application. SD = Significant difference.

2017. Maize cv P9074. Treatments applied on 12th June 2017 in dry soil conditions at crop GS15. Weed populations in untreated at application: Fat Hen – 10 plants per sqm; Creeping Thistle - 5 plants per sqm; Cleavers – 5 plants per sqm

Weed control benefits with Sorrento were again reflected in yield

Effect of Sorrento with nicosulfuron on whole crop yield (t/ha) in Maize

2017. Maize cv P9074. Treatments applied on 12th June 2017 in dry soil conditions at crop GS15. Crop harvested on 17th October 2017.

Advantages of Sorrento

  • Superior penetrating power helps post-emergence herbicides with high water solubility to penetrate leaf cuticles, even in cold conditions – the biggest barrier to effective weed control

  • Low dose, low odor and excellent compatibility with other crop protection products in the tank mix 

 

How to use Sorrento

For more information on how to use Sorrento, please go to the Sorrento product page and request a copy of our product guide. We’ll get a copy of our Technical Guide right over to you.

Sorrento

Sorrento

For more information on Sorrento

Get in touch

Require technical assistance or product information? Please get in touch with our Technical Manager, Stuart Sutherland.

For all other general enquiries, please email or call us at the office. If you’d prefer, drop us a message using our contact form and we’ll get back to you as soon as possible.

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