Weeds biological control methods

Weed biological control is the use of insects, pathogenic microorganisms, animals, plants and other organisms in the agro-ecosystem to control weeds below the level of their economic hazards through a symbiotic relationship. The main effects of weeds biological control are: to prevent weeds from solidifying, to reduce the capacity of weed seed banks in the soil; to reduce the number of weed germination seedlings, to control their populations below their economic hazard levels; to suppress the growth of weeds; Its population growth is controlled below its economic hazard threshold. The types of weeds biological control mainly include the treatment of grasses with insects, the treatment of grasses with bacteria, herbicides such as herbivores, and herbicides with plants.

1. Treat grass with insects. Cyperus rotundus is a common weed in vegetable fields. After research, it has been found that the newly hatched larvae of the aconite seedlings can be carried back to the leaf heart along the leaves of the toadstools, and the silkworms spit into the tender heart to make the heart. The leaves wilted and died of wilting, and then they intruded into the bulbs and bitten off the conducting tissues, resulting in the death of the whole plant. Grassworm insects must meet the following conditions: the host is highly specialized and only harms the target weeds; the ecological adaptability is strong; the fertility is high; and the weed control effect is high.

2. Treat grass with bacteria. Some fungi have a good control effect against weeds. They have parasitic rust and powdery mildew, and they can inhibit hard-to-erase rootless weeds, red cornflowers, and field weeds, and rust can make them great. The deformation of stems and leaves until it stops growing can result in the death of 80% of giant salamanders.

3. Weeding with birds and fish. The use of poultry and fish can remove weeds and turn weeds into organic feed for poultry and fish, such as the habit of weeding ducks (geese) in aquatic vegetable fields. After waiting for the aquatic vegetables (such as white rice, etc.) to become a plant, the duck can be eaten in the paddy field to eat some weeds. In addition, fish farming and weeding in water can also have good results. For example, grass carp has a large amount of weeds, and it has inhibitory effects on more than 20 species of weeds in 15 families. In high-stem dry-land vegetable fields, ducks are rushed into the field to feed on weeds and can also receive good weed control.

4. Use plants to cure grass. In the control of weeds in farmland, the use of different genotypes of plants can effectively kill some weeds. For example, some cucumber varieties can inhibit the growth of white mustard and barnyardgrass; overwintering vegetables with straw can reduce the danger of looking at Acacia.

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