Nov. 11, 2011
Here is the next installment in the series on 'answer line person' Richard Jauron's experience with the control of nimblewill with Tenacity (mesotrione). You will find other installments from this summer and fall.
We're going to follow this until well into next year when we know how successful this has been.
FROM RICHARD JAURON:
Here is a short chronology of my experience treating nimblewill infested areas in the lawn with the herbicide Tenacity (Mesotrione). (Previous blogs on this topic were posted on July 7, 2011 and August 2, 2011.)
On Tuesday, June 28, 2011, I treated nimblewill infested areas in my lawn with Tenacity. (One-fourth teaspoon of Tenacity and three-fourths teaspoon of a non-ionic surfactant (Turbo Spreader Sticker) was added to 2 quarts of water.)
Within 2 or 3 days, the nimblewill foliage turned light green. Within 7 to 10 days, the uppermost growth turned white. (See photos 1 and 2)
At the end of 3 weeks, the lowest portions of the nimblewill were still green. Most of the upper portions of the nimblewill were white or brown. (See photos 3 and 4)
The nimblewill was treated a second time on Tuesday, July 26, 2011. (One-fourth teaspoon of Tenacity and three-fourths teaspoon of a non-ionic surfactant was added to 2 quarts of water.)
By late summer, the Tenacity treated nimblewill had turned completely brown and appeared to be dead. The following photographs were taken on September 15, 2011. (See photos 5 and 6). While the nimblewill appears to be dead, the effectiveness of Tenacity won’t be known until late spring/early summer of 2012. If any of the nimblewill has survived, it should begin to green up in late May or June.