| Eichhornia crassipes (Mart.) Solms, is a perennial monocotyledon. Water hyacinth originated from South America, has been distributed in more than 60 countries and regions all over the world. It has been badly threatened to ecological environment, agriculture, fishery, health of citizen and waterway transportation. Herbicide control of water hyacinth is the most famous method to control water hyacinth, despite unwanted side effects (e.g. environmental pollution) of this herbicide use. The research is consist of three main sections to discuss, which are effect of herbicides control against water hyacinth, effect of typical mouths factor on herbicides control, and effect of adjuvants and form of pesticide formulation on herbicides. The conclusions are as follows:1.Efficacy of 2 herbicides agaist water hyacinth are measured. The results show that action of herbicide 2,4-D dimethyl amine salt to water hyacinth is rapid, controlling efficacy of the weed is high. Dose titrations of 2,4-D at 1290 g a.i./hm~2 can effectively control the weed. And the results show that dose titrations of glyphosate at 615 g a.i./hm~2 can control extension the community of water hyacinth.2.The results of two typical mouths factor on herbicide against water hyacinth show that 2,4-D dimethyl amine salt's efficacy of May is better than November. And the results suggest us to control water hyacinth with 2,4-D dimethyl amine salt at May. More leaves are needed when control water hyacinth by glyphosate. The control time cannot be confirmed immediately.3.Jiabeisha is selected as the best adjuvants by measuring effects of three adjuvants Jiabeisha, azone and silicone on two herbicides glyphosate and 2,4-D dimethyl amine salt. Under field conditions, Jiabeisha can increase effect of 2,4-D dimethyl amine salt on controlling water hyacinth obviously. It can decrease dose with 645~1290 g a.i./hm~2.4.Efficacy of oil suspension agent of glyphosate 1800 g a.i./hm~2 is better than its aqueous solution agent at 1845 g a.i./hm~2.
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