Previously I described success in killing honeysuckle with October and May applications when the leaves were on the stems of the shrub. Here are a few kill counts we have from dormant season applications with leaves off:
March 6 and 7, 2011: 80% kill from basal bark application to about 70 plants.
April 10, 2010: 100% kill from basal bark to a few dozen plants.
April 1, 2012: 100% kill from basal bark to 24 plants.
Here is a nice quote from an experiment by Ronald Rathfon “…month of application did not affect the three triclopyr-containing herbicide treatment efficacy rates, which exceeded 95%…” (2006 North Central Weed Science Society Proceedings).
So the last few posts I have made the case that basal bark application works in any season, but don’t apply it in hot weather as it volatizes.
And kudos to Mike Carr, Volunteer Steward of Nachusa Grasslands who has been helping me note basal bark treatments of honeysuckle.
One more basal bark post to follow, then a post on foliar application and mowing.