The greenhouse vegetable nursery is mainly carried out in winter and spring. To do a good job of disease prevention during this period will play a decisive role in increasing production and income. Now we will briefly introduce the methods of chemical control. First, greenhouse fumigation disinfection 1, before every 160 square meters with sulfur powder 250 grams, 500 grams of sawdust, at 19 o'clock in the evening began to smoke a day and night disinfection. When fumigated, the temperature is kept at 20°C. At the same time, there must not be any green plants in the shed to avoid phytotoxicity. 2. 20 days before the planting of the soil, the ditching is applied, the ditch depth is 15-20 cm, the ditch is 20-30 cm, and 5 kg of WP wet weight 2.5 kg per mu and 40-50 kg of fine soil are mixed into the poison. The soil was scattered into the ditch and covered and compacted. Loosen the soil 3 to 4 days before sowing to prevent phytotoxicity. 3, rack disinfection with 1% potassium permanganate solution sprayed, the rack is fully disinfected. Second, the cultivation of disease-free seedlings 1, bed seed disinfection with 40% nitrochlorobenzene powder, 5% thiram WP and 25% metalaxyl WP mixture, the amount of 8 grams per square meter. First mix the pesticide with a suitable amount of fine soil, and then spread 1/3 of the amount of the soil to the bed soil or the sowing ditch that has been soaked, then sow, and cover the seed with the remaining 2/3 of the soil, and finally cover the soil. . Or fill 10 to 18 kg of formalin with 360 ml of water per 10 square meters. Pour 20 days before sowing on the seedbed soil, and cover with heavy plastic film or sacks for 4 to 5 days. Remove the cover and then place the bed soil. Loose and dry until 2 weeks before sowing. 2, seedling disease prevention and control 1 with 70% mancozeb WP and 25% metalaxyl wettable powder spray 1:1800 times, can prevent damping-off, blight, root rot. 2 Use 50% thiram WP and 25% methicillin wettable powder 1:1 mixture to mix proper amount of dry fine soil or fine sand, spread evenly on the diseased seedlings, and pile up the pesticide soil around the seedlings to form a " "Pharm gardens" to prevent disease expansion. 3 The “praying drug†should be applied 7-10 days before planting to prevent the seedling disease from being brought to the planting field. Including: Melon medicine 75% white bacillus wettable powder 1:1:1,800 times liquid and 98% chlorotoxin original powder 5000 times spray, can prevent downy mildew, gray poison, scab, horn Spot disease. Tomatoes and peppers are sprayed with agricultural streptomycin plus 5% thimacendazole wettable powder 25% metalaxyl WP wettable powder 1:1:1,800 times to prevent gray mold disease, anthrax, anthrax, scab, etc. .
Blood Collection Needle
Blood Collection Needle,disposable blood collecting needle,retraction type blood collection needle
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