Weed control in small dams. Part II Control of salvinia, azolla and of water hyacinth.
Effective biological methods include Cyrtobagous salviniae against Salvinia molesta and Neochetina eichhorniae and Sameodes albiguttalis against Eichhornia crassipes. Successful chemical control methods are Farmco AF 100 at >1.5 litres/ha for S. molesta and at 30-80 litres for Azolla. Diquat at 1.1-2.2 kg/ha is also effective against Azolla. E. crassipes can be controlled by 2,4-D at 2.2 kg/ha. Information on application times and techniques and relevant precautions required is given.