Looking closely at this Illinois Pondweed, one can see the browning and veination indicating that the upper portion of the plant has been successfully treated. The primative cellulose structures holding the plant erect in the water column are lysed and broken apart. The plant will fall over or out of the water column quickly as it succubmes to wind and wave action. Over the next few days and weeks it will decompose and release the nutrients it had locked up in its structures.