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2015 frost effects on clethodim resistance

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2015 frost effects on clethodim resistance

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2015 frost effects on clethodim resistance

  1. 1. Life Impact The University of Adelaide Field failures are not always due to resistance. (verify with a test) Getting the most out of DIM herbicides • Spraying younger plants vs waiting to ‘get them all’ • By default, earlier spraying • Younger weeds • warmer conditions • Less chance of frost • Reduced control when ryegrass stressed • Spray before frost vs after frost Slide 1 Improved efficacy
  2. 2. Life Impact The University of Adelaide Effect of cold period/ frost before and after clethodim treatment on ryegrass 1 10 0 20 40 60 80 100 S No Frost S Frost Pre S Frost Post Clethodim (g ha-1 ) Dryweight(%control) 2013 1 10 100 0 20 40 60 80 100 NF FBS FAS Clethodim g ha-1 Survival(%) 2014 Clethodim g ha-1 Survival(%) 1 10 100 0 20 40 60 80 100 NF FBS FAS 2012 Frost or cold period before or after spraying can reduce clethodim efficacy • NF = no frost, • FBS= frost before spray • FAS= frost after spray
  3. 3. Life Impact The University of Adelaide Managing clethodim resistant ryegrass in canola- IWM strategies. • Reduce seedbank to take pressure of DIMs eg. knockdowns, pre-emergent & seed-set control • Seed-set control- manage survivors/ late germinators. • Target young weeds • Warmer temp’s can increase DIM activity • Frost after clethodim application reduces efficacy. • Addition of low rate Factor (80g/ha) may improve clethodim activity • Rotate- glyphosate, TT, CLR • Alternative MOA herbicides

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