Water hyacinth, also known as water hyacinth, water hyacinth, etc., the rainbow family perennial aquatic herbaceous plants. Native to South America, was introduced into China in the 1930s. Floating or rooted in the mud, when the density is not large, the formation of short spherical petiole (so called water hyacinth). Covering the water surface, blocking the river, affecting navigation, drainage and irrigation and aquaculture; destroying aquatic ecosystems and threatening local biodiversity.

Methods of prevention and control

(1) Physical prevention and control of the organization of boats or artificial salvage, the salvage of water hyacinth on the shore in a timely manner to clean up.

(2) chemical control ① in the paddy field ridge or vegetable empty stubble field, every 667 m 2 use 20% make it Long emulsion 50 ml, water spray. Every 667 m 2 use 20% make it so that the dragon emulsion 25 ml plus 20% dimethyl tetrachloro sodium salt water 125 ml plus laundry detergent 7 grams, mixed spray, can reduce costs and increase efficiency. Orchards, dwarf ginkgo forests and lawn land can use the above agents for directional spraying. ② River, pond, ditch side, per 667 meters 2 use 41% Nongda water 300 to 400 ml, 30 grams of grass smoke, paraquat 60 grams or 36% glyphosate? Chlorosulfur soluble powder 300 grams, water 20 kg spray fine mist, so that the liquid adheres to the water peanut stems and leaves. Try to avoid spraying directly onto the water surface and causing fish death.

(3) Biological control in late spring or early summer, when the minimum temperature rises steadily to 13 ℃ or more, every 667 m 2 release water hyacinth weevil adults 1500 to 2000.