Traditionally we have used 2,4-D or 2,4-D + MCPP + Dicamba (i.e., Trimec, Weed-Out,
Weed-B-Gon). These products should be sprayed during March on a day that is at least 50
degrees. Newer products are Weed Free Zone and Speed Zone. Both are combination products
that contain a formulation of Trimec plus carfentrazone. These will give a quicker response at
cooler temperatures than 50 degrees. A spreader-sticker added to the spray should help any of
these products be more effective. At times, the spreader-sticker is already mixed into the weed
killer; no additional amount is needed. These herbicides are also effective on dandelions.
Unfortunately, we have not had a good chemical control for Star-of-Bethlehem. The best
products we had were Coolpower (31.3% control) and Turflon Ester (23.8% control). Coolpower
is a commercial only product, but Turflon Ester is available to both commercial and homeowner
users. But research out of Virginia Tech has improved our outlook. Scientists there did a study in
which they gained 96% control of Star-of-Bethlehem one month after treatment by using
Quicksilver, a formulation of carfentrazone at the rate of 4 fl. oz/A. Quicksilver is a commercial
only product, and therefore is not available to homeowners. However, both Speed Zone and
Weed Free Zone contain carfentrazone and would certainly be worth a try if you have this
troublesome plant. (Ward Upham)