I wanted to kill the new crabgrass that has emerged in Mid-summer, even with a properly timed pre emergent treatment of Surflan at 1 gallon an acre rate sprayed between April 2 -3. At the correct time for pre emergent application and rate, I still received crabgrass sprouting in late June. I purchase Drive XLR8 Herbicide Crabgrass, Dismiss, and Gordon's Trimec 992, plus, the recommended surface adhering adjuvant -mentholated seed oil. With 10 acres of grass, I have to find a cheaper way to create my own Gordon's Q4; it only costs a $100 an gallon/acre vs $123 gallon/acre Q4 premixed. It seems that when following all the spraying prerequisites; applying 2 days after mowing, watering before and a day after treatment, with temperatures in the low 80s, and mowing a week later. Yet, I only received 60 -70 % kill of crabgrass after 10 days. This Q4 cocktail did kill all the other broad leaf and nutsedge weeds, but truly $adden by results. I don't know if Drive only kills crabgrass at the very beginning of growth phase up to 4 tiller stage? Once the new crabgrass has been mowed, who really knows it's growth stage? However, I did notice that areas that where the lawn tractor tire pressed down the grass, there was almost +95 % kill rate in those strips. This suggests that dragging a chained plastic pipe behind the 14 ' boom sprayer may cause the same phenomenon I experienced. However, what a mess to tow and not get caught up on something when spraying 10 acres. Hypothesis, the mechanical stress damage to the plant's cuticle might allow a lethal dose of Drive's ingredient, Quinclorac, into the crabgrass. Note: this same tire track treatment did not hurt any cool weather or Kentucky Bluegrass at all; all the cultivated grass stayed very robust and green. Bottom Line: More work needs to be done by the manufacturer, BASF, to enhance their products success rate with Crabgrass et al.
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