Search results with tag "Northern iwm fact sheet"

Northern IWM fact sheet - Department of Agriculture and ...

apply herbicides when the plant is a small rosette, preferably 5 cm in diameter or smaller, and definitely prior to stem elongation, as control efficacy declined as plants mature. Table 1 includes the range of registered herbicides and shows that overall efficacy was reduced from 92% on 1-month-old weeds to 77% on 3-month-old weeds.

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