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.
Was this review helpful to you? YesNo
13 of 15 people found this review helpful