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CRT Catalogue Pull-out Feature : Crop Feature - Autumn 2013
www.crt.com.au There’s always better value at CRT. Go to www.crt.com.au to register and receive your next issue via email. Crop Protection TechUpdate–Autumn2013 Most farmers and advisors involved in cropping are tired of hearing about the resistance of annual ryegrass to a range of herbicides. However, with the release of Sakura® and the continued strong performance of Boxer Gold® in the paddock there is a way forward in managing this issue. Whilst tried and proven mixtures of trifluralin and Avadex® extended the management options for ARG control, it’s been the new products which are providing a real opportunity to change the way farmers and advisors target weeds and manage paddocks. Improved crop rotations and effective herbicide options can now work together to significantly reduce the impact of grass weeds as well as increase crop yields through reduced competition for nutrients and water. In its first year of commercial release, the feedback from the paddock has been very positive with regard to the way Sakura has performed. It will be very important for farmers who have experienced success with Sakura in 2012 to look toward using alternative pre-emergent chemistry by mixing it up in 2013 with either good crop rotation or the use of another herbicide. Further development of Boxer Gold is still progressing with Syngenta looking at a number of alternative crops and different use rates and timings. A benefit of Boxer Gold is the ability to use it in barley crops as a pre-emergent herbicide, especially in those areas where other pre-emergents and mixes have been struggling to provide adequate control, or where there has been crop damage. Whilst the new products continue to draw the headlines for providing good control where there is resistance to post emergent herbicides, trifluralin is still providing strong control in many areas of Australia as a pre-emergent, especially when mixed with Avadex which is showing synergistic improvements in the control of a range of weeds. As with any herbicide there is the risk of resistance and continued reliance on single modes of action to control weeds will eventually lead to resistance. New products provide pre-emergent control options Post emergent weed control Sakura® • Lower grass weed competition in crop • Increases options whilst reducing the risk of application failure • Slows the build-up of resistant weed populations where they are not already established • Increases cropping options (rotation not solely resistance status dependent) REMINDER – use rate for Sakura is 118g/ha The key issue for post emergent control of weeds this year will be herbicide resistance in both grass and broad leaf weeds. In many areas of Australia one of the key issues will be the developing risk of glyphosate resistance to a range of key weeds, including annual ryegrass, which is also resistant to many other herbicides. One of the easiest ways to manage resistant ryegrass is to move to a double knock spraying program in front of your crop or pasture. The products to be used and the timing between the first and second spray will depend on where you are and the weeds that need to be controlled. This type of program, where glyphosate is followed by Spray.Seed® or other knockdown products or practices, has the ability to significantly reduce the risk of developing weeds resistant to glyphosate and other herbicides. One of the keys in using this process is to ensure that full rates of herbicide are used to kill the weeds. The gap in application should be discussed with your local CRT agronomist to ensure the best results are achieved as there are significant differences including product choices for each weed type, eg fleabane, volunteer cereals and ryegrass. Managing weeds in cereal crops is becoming more difficult. There has always been concern that products such as Achieve could cause a reduction in yield, however, ongoing trial work by a number of GRDC funded, state-based government agencies has shown that there is little risk in wheat and barley crops from the use of Achieve® when used as indicated on the label. For many years, effective post emergent grass weed management in canola and pulse crops has relied on clethodim, however, herbicide resistance has meant that this herbicide is quickly coming under significant pressure. The original effective rates of clethodim were as low as 250mL/ha although recently the high use rate of 500mL/ha for the control of annual ryegrass has come under significant pressure and researchers and agronomists have been looking for ways to manage this issue. A number of options have been tried including split applications and mixes of clethodim and other actives to increase the effectiveness of products containing this active. With on-farm resistance issues changing quickly talk to your CRT agronomist for the best local advice and help developing a farm management plan to combat this problem. CRT Info ActIve 31981_v2_CRT Tech Update Autumn 2013.indd 4 31/01/13 11:18 AM
Crop Feature - Winter 2013