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Herbicide application fact sheet: Effective double knock herbicide applications - Northern Region
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Optimal timing between applications is dependent upon the herbicides used and the weeds being targeted... The most common double Knock approach is to apply a systemic herbicide (for example Groups A, i or M are frequently used) when conditions are favourable for maximum translocation, and then follow it with a contact herbicide such as the bipyridyls (Group L)... double Knock trial results show consistently high performance when applied to small weeds (prior to tillering for grass weeds and prior to stem elongation for broadleafs) and the applications are applied on time with correct application set-up and climatic conditions...