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CRT Catalogue Pull-out Feature : CRT Summer 2013 - Tech Update
While the introduction of a range of new insecticides over the last few years has been welcomed by all stakeholders, a recent report by Dr Greg Baker of SARDI and published by Horticulture Australia Limited has raised some significant concerns. The study, Mechanism and Management of Insecticide Resistance in Australian Diamondback Moth, reported that some field populations of Diamondback Moth (DBM) have now developed significant levels of resistance to two important new insecticide groups, IRAC Group 6 (eg Proclaim®) and Group 28 (eg Belt® and Coragen®), and that these resistance levels are already reducing the field control achieved with these insecticides. Further, the DBM lab strain which has acquired high resistance to emamectin benzoate (Group 6) is exhibiting cross-resistance to the diamides insecticides (Group 28). Studies are underway to determine if the resistance mechanism(s) in this lab-selected strain is/are the same as those evolving in DBM field populations in response to growers increased use of emamectin benzoate. If this is shown to be the case, then cross resistance between Group 6 and 28 insecticides in the field is likely, and the ‘two-window’ resistance management strategy will need to be revised to take account of the cross-resistance risk for Group 6 and 28 insecticides. One interesting finding from the report suggests that these newer DBM insecticides may vary in their risk profile to selection for resistance. Chemistries such as indoxacarb (eg Avatar®) and spinosad (eg SuccessTM NaturalyteTM) and, presumably, spinetoram (eg Success Neo) are likely to be at lesser risk than chemistries such as emamectin benzoate and the Group 28 diamides. The recommendation is that this information should be factored into industry management plans. Although this report can be viewed as a positive endorsement for Success Neo and Avatar while raising concerns for the others, it is highly recommended that growers utilise a chemical rotation strategy to prolong the active life of all chemistries. John Gilmour, Horticulture Business Manager with Dow® AgroSciences, recommends growers contact their local CRT store to seek the best professional agronomic advice in formulating their resistance management strategies. For more information on the study, visit www.sardi.sa.gov.au TM® are trademarks of The Dow Chemical Company (“Dow”) or an affiliated company of Dow. Proclaim® is a Trademark of a Syngenta Group company. Belt® is a Registered Trademark of Bayer. Avatar® and Coragen® are trademarks or registered trademarks of DuPont or its affiliates. National Marketing Manager - Crop Protection, BASF Australia. For weed challenges which cannot be solved with glyphosate alone In contrast to several other Group G products, Sharpen WG has strong activity on a wide range of broadleaf weeds and, importantly, provides standalone control. Sharpen WG’s ability to move in the plant also gives you better control. This means when used in combination with glyphosate, if the glyphosate provides poor control of the weed, Sharpen WG will still do the job – an important feature for herbicide resistance management. SARDI Study raises concerns for Brassica growers Sharpen® WG controls Australia’s toughest broadleaf weeds where conventional herbicides fail Bladder Ketmia Bindweed Burr medic Marshmallow Heliotrope Prickly lettuce Vol cotton (max. 6 leaf) Wild radish Wild turnip Wireweed Fleabane (max. 6 leaf) 17g/ha Ideal conditions Low stress Seedling weeds 26g/ha Tough conditions High stress Larger weeds 26g/ha Ideal conditions Low stress Seedling weeds 34g/ha Tough conditions High stress Larger weeds Guideline rates when using Sharpen WG herbicide Photo courtesy CSIRO
CRT Spring 2013 - Tech Update
CRT Autumn 2014 - Tech Update