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Herbicides and Rates for Perennial Weed Control (06/16/16)

Question: Our weed board is going to try Panoramic at 4 fl oz/A + Tordon at 1 pt/A + MSO adjuvant at 1 gallon/100 gal of water. Weeds to be controlled are Canada thistle, leafy spurge and absinth wormwood. Do you feel that Overdrive should be added also or will this give good control?

Herbicides and Rates for Perennial Weed Control

Question: Our weed board is going to try Panoramic at 4 fl oz/A + Tordon at 1 pt/A + MSO adjuvant at 1 gallon/100 gal of water. Weeds to be controlled are Canada thistle, leafy spurge and absinth wormwood. Do you feel that Overdrive should be added also or will this give good control?

Answer: Panoramic is a generic formulation of imazapic so it is the same active ingredient as Plateau. The mixture you have will control all three weeds you are targeting and Overdrive is not needed. However, the correct application rate is very important. The rates you mention are correct for 1 acre, not 100 gallons unless you are applying 100 gallons per acre. You need to know the rate per acre you are actually applying. For instance, if you are applying 20 gpa of water with 100 gallons of water in the tank, then the rates need to be multiplied by five, i.e. 20 oz of Panoramic + 5 pints of Tordon + 5 qt of MSO (the correct rate of MSO is 1 qt/A).

So you need to ask how many acres are treated with a 100 gallon tank? Then you will know the proper rate. People may be mixing and spraying the rate recommended in the weed guide in 100 gallons of water thinking they have the right rate but end up with poor control and spray the same land every year.

 

Rod Lym

NDSU Weed Scientist, Noxious /Perennial Weeds

 

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