In agriculture, snails, clams, and snails that harm crops are collectively referred to as harmful molluscs. They can feed on rice, white rice, vegetables, flowers and other crops. They have a wide range of hazards, high food intake, and strong livelihood. Some of them also have hard shell protection and are difficult to control. Therefore, we must adopt comprehensive prevention and control technologies to suppress the damage. 1, agricultural control. Common harmful molluscs, such as snails and clams, mostly prefer to live and live in weedy, wetter environments. Weeds and debris are removed from the fields to improve the ventilation and light conditions of the farmland. Simultaneously, quicklime (5-7.5 kg/mu) is distributed between the ditch, land, and crop lines, which can effectively suppress the breeding and damage. 2, biological control. Ducks in farmland can both eat snails and snails, and increase duck production. According to a survey conducted by the Wenzhou Academy of Agricultural Sciences and other units, an empty-bodied Pekin duck has been stocked in a ditch for 2 hours and can have 14 snails of 1-2 cm diameter and 9 local ducks. The biological control technology is popularized and applied in the 3500-mu demonstration plots. The stocking density is 2-2.5 mu/mu. Even if the molluscicide is no longer used, the purpose of controlling snails can be achieved. 3, vinegar trapping. Every morning or evening, soaked greens and grasses are sprinkled between rows of crops and at the edge of the field, which can effectively induce lice to feed and then kill them. 4, chemical control. By the end of 2002, there were 10 pesticides for molluscicidal animals that had been registered on the market in China, and the following are commonly used: Baihuo 70% WP can kill the snails in the field, and the amount of mu is 29-33 grams. Toxic soil is sprayed or sprayed; 50% of the snail produced in Sichuan kills wet snails with 60-80 grams per acre, and usage is the same as above; 6% Myda granules are used to kill rice snails and cotton fields and vegetables. Field and tobacco field snails and clams, with an amount of 420-600 grams per mu. The application of Swiss imported Metha 5% granules can also kill the above-mentioned harmful molluscs. The amount of mu is 480-660 g for rice fields and 480 for vegetable fields. - 660 grams, 467-667 grams of cotton fields and tobacco fields; 2% of sprinkler bait applied to kill dry land snails, can kill dry land snails, 500-600 grams of mu, such as for the control of earthworms, acres of 333-500 grams; spray Shibai Hezhu 45% WP, can kill the rice field sweet snail, mu dose 40-60 grams; ground application of 6% propolis star granules, farmland snails can be controlled, the amount of 567-750 grams of acres; applicator 6% addition Colt No. 2 poison bait, can kill dry land snails, 650-700 grams per mu; surface spray copper sulfate + Nicotinanilide 50% acid soluble powders, can prevent snails paddy fields, the amount administered per cubic meter of water 4 g.
The appearance is tan, and the cork is red-brown at the flaking; there are intermittent stripes on the branches, nodules are enlarged, and the shape is like a bead. Most of the hard and delicate roots and fibrous roots are born, and some surfaces are smooth and smooth, such as stalks. It is commonly known as "crossing the river branches" or "crossing bridges"; there are brown scales on the upper part, and there are residual stems or petioles that have not been cleaned at the top. The quality is firm and hard, the section is irregular, the skin is dark brown, the wood is golden, the rays are cracked, the central pith is red and yellow, and occasionally hollow. Odorless, very bitter taste, chewing saliva can be dyed red and yellow. It is better to use fat, beaded, solid, red-yellow, no residual stems and fibrous roots.
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