Agri-Shop Ltd
Farminguk
29 June 2016 | Online since 2003
Auto Trader Ltd


20 February 2014 04:27:34|

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



0 Comment


Name

Please enter your name


Email

Comment

Please enter your comment


Post Comment

Your comment submitted successfully.Please wait for admin approval.


Comments

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


Australia | 28 June 2016
Dairy farmers face tight squeeze

High-cost dairy farmers face a tough outlook after industry behemoth Murray Goulburn set an opening farmgate price for the 2017 season of just $4.31 a kilogram, some 14 per cent below the $5 a kilo on...


USA | 28 June 2016
Dealmaking in agriculture is vibrant, causing some to worry

The wave of agribusiness mergers and acquisitions is likely to continue rolling. After several blockbuster deals that have been announced since December, analysts said the divestitures required to ...


USA | 28 June 2016
How to revive local agriculture in the United States

“I think this administration has really missed their chance to do some innovative things, but also to help the rural economy,” Representative Chellie Pingree said on Monday. The Maine Democrat is ...


Uganda | 28 June 2016
Investors flock Uganda’s Dairy farming industry

The Ugandan government has said that the livestock sector is attracting more investors especially in dairy processing which in turn is helping farmers earn more from the sector. President Museveni ...


USA | 28 June 2016
Farmers and ranchers mixed on immigration

The Supreme Court’s split decision on immigration last week is only ratcheting up commentary this election cycle. It is also creating unease for those operations that rely on immigrant labor. We’ve...



Trending Now

Viewed
Discussed

Farms and Land for sale

PropertyLocation
PropertyAgent
PropertyMinimumPrice
PropertyMaximumPrice
PropertyCategory

Holiday Rentals search

AccommodationKeyword
AccommodationType
AccommodationCounty
AccommodationStarRating


Top stories you may have missed
closeicon
Username
Password