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Hydrilla can be controlled by physical, chemical and biological methods, or by a combination of these methods (integrated pest management).
The removal of plants either manually, using hand tools, or mechanically, using machines, is relatively expensive. Several machines, developed for aquatic weed control, can be used to remove H. verticillata plants from irrigation canals and drains; these include mowing buckets attached to a tractor or hydraulic excavator.
Different harvesters can be used to remove H. verticillata from lakes; these harvesters collect the plant material and dump it on the shore. One problem in the use of these harvesters is that cuttings of hydrilla, which are not removed from the water, help to spread the weed. Using mechanical control of hydrilla on large lakes without the use of herbicides or other control methods has not been feasible because of high cost, short-term effects and logistical constraints (Hetrick and Langeland, 2013).
In the USA, lake drawdowns are occasionally used to expose the plant and dry it out (USDA, 2011).
Due to the variable regulations around (de-)registration of pesticides, we are for the moment not including any specific chemical control recommendations. For further information, we recommend you visit the following resources: