Mr French,
Please know your herbicides before posting! Dicamba is not a component of 2,4-D .Dimethylamine salt of 2,4-dichlorophenoxyacetic acid. This can be found in ester or amine formulations.
Dicamba is 3,6-dichloro-o-anisic acid. Be careful with Dicamba as it is becoming a hot button product in the ag market recently. Drift control is a problem for farmers who have not planted some of the newer Dicamba resistant soybeans and the neighbor has and subsequently used Dicamba in their weed control. Because of high volatility drift occurs and crops are damaged and law suits follow close behind.
Sorry for the hijack but Dicamba is hotter than 2,4-D and Centipede could be injured if products are mis applied!!!