24 May 2015 | Online since 2003



20 February 2014|Arable,Cereal,Crops,News

Simulation predicts herbidice resistance in weeds


Effective herbicides are essential to rice production in the mid-southern United States. In recent decades, the primary weed that challenges rice fields, barnyardgrass, developed resistance to two widely used herbicides – propanil and quinclorac.

To ensure that current herbicides remain effective, a simulation model is being used to predict the weed’s resistance in future years to guide weed management plans today.

Barnyardgrass can reduce rice yield up to 30 percent, and herbicides are the major component for controlling the weed. Simulation models can be beneficial in understanding the resistance evolution and developing strategies to prevent it.

An article in the journal Weed Technology discusses the development of a model that can analyze the simultaneous evolution of resistance to herbicides that inhibit the acetolactate synthase (ALS) and acetyl-CoA carboxylase (ACCase) enzymes. The model assumes the use of Clearfield rice, a commercial brand of rice cultivars that is resistant to certain ALS-inhibiting herbicides.

Using data from three locations in the rice-growing Mississippi Delta region of eastern Arkansas, the computer simulation model creates weed management scenarios across 1,000 hypothetical rice fields. The model takes into account three stages of growth—dormant seedbank, emerged seedlings, and mature plants—and extends over a 30-year period.

The simulation shows that if an ALS-inhibiting herbicide was used alone in three annual applications, weed resistance would develop within 4 years. Weed management that used both ALS- and ACCase-inhibiting herbicides reduced the risk of barnyardgrass developing a resistance to the ALS-inhibitor, but found a higher risk for the weed developing resistance to the ACCase-inhibitor by year 14. Resistance to both of these herbicide types when used together was predicted by year 16.

Several weed management strategies were revealed through the simulation model. An important insight was that if a grower does not stop using an herbicide soon after resistance to it evolves, resistance can be accelerated for the next herbicide alternative employed even if it provides a different mode of action.

Minimizing the weed seedbank should be the focus of successful weed management. The model shows that diversified management techniques combined with timely applications of herbicide is the best way to achieve positive results.

Download




Comments


No comments posted yet. Be the first to post a comment

To post comment without approval login or register

Display name

Please enter your name

Email (optional)
Comment

Please enter your comment

Post Comment

Your comment submitted successfully.Please wait for admin approval.

Some error on your process.Please try one more time.



Jobs


8 May 2015
HGV (C+E) Milk Delivery Drivers - Carlisle - Nights - Full Time
Duties to include collection of caged milk tets from the dairy for onward delivery to DC's throughout the UK. Due to our cont...

19 May 2015
Outdoor Pig Stockpeople
Outdoor Pig Stockpeople required by Fawley Farms for outdoor sow units producing weaners near Beer, Seaton. Would suit people...

7 May 2015
Professor/Associate Professor in Production Animal Health & Management
Agriculture, Food and Veterinary. Continuous Full-Time (tenure tracked) position....

15 May 2015
milk rounds person
Apply B&B Dairies on 01425 475435 Please refer to the Job Description to view the requirements for this job. Req at a Rin...

5 May 2015
Parts Advisor and Trainee Parts Advisor
Haynes Group of Companies Come and join a leading, well established and award winning family run business! New Holland Agricu...



Top stories you may have missed
15 May 2015 | Arable

Scotland’s Rural Affairs Secretary Richard Lochhead is calling on the Europ...


15 May 2015 | Finance

As the country settles down following the turmoil of the general election, ...


14 May 2015 | Animal Health

New research from the Universities of Bristol and Cambridge has found that ...


13 May 2015 | Animal Health

A new publication to help farmers prevent sheep lameness and offer advice o...


12 May 2015 | Agri Safety

The Farmers’ Union of Wales is putting the spotlight on Liver fluke at next...


5 May 2015 | News

The UK is now third in the global rankings for utility-scale solar energy a...


29 April 2015 | Agri Safety

A recent Rural Watch demonstration and information event gave Farmers’ Unio...


24 April 2015 | Meat Processing

Retailers should confirm their commitments to sourcing UK lamb this season,...


15 April 2015 | Meat Processing

A leading retailer has apologised after selling imported lamb in a Borders ...


9 April 2015 | Finance

The time has come for landlords to expect to see reductions in farm rents, ...