1.8 x 43.5 = amount u need over that acre mixed in the 21 gallons.
If your using pendulum use 1/2 of full rate and spray it twice over 6 to 8 weeks..
Same with princely, but do not do a 2nd app.
Just my opinion.
Glyso use at full rate. 2nd app use 24d if needed.
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