Tomato seedling disease prevention technology in the basin

The cultivation of tomatoes in the Sichuan Basin can be highly productive and has a lot to do with cultivating strong seedlings. However, due to a variety of reasons, tomato seedlings are susceptible to various diseases and have a great adverse effect on the growth of tomatoes. The more common are damping-off, gray mold, blight, late blight and roots.
Bumping disease: It can be controlled by rapid seeding, soilless seedlings or seedling-free seedlings.
First, the seedbed treatment: 15-20 days before sowing, the soil will be flattened, with 40% formaldehyde solution (formalin) 50 ml per square meter, add water 2 - 4 kg, evenly poured on bed soil, Then cover it with a film or sack for 4 to 5 days, remove the cover, turn the bed soil 2-3 times, and sow 10-15 days. Can also be used 50% carbendazim WP and 50% thiram WP mix 1:1, 8 to 10 grams per square meter, add 10-15 kilograms of soil mix into a medicinal soil, will be three points when sowing The second is to spread the medicinal soil on the surface of the pod, so that it is covered with one-third of the drug soil after sowing.
Second, seed treatment: warm soup soaking can not only kill the germs carried on the seed, but also from the role of germination and early emergence; pharmaceutical treatment, can be used 50% thiram WP 300 times or 50% carbendazim WP 800 times liquid; or with 25% metalaxyl wettable powder 1500 times and 65% zein zinc wettable powder 1500 times 3:1 mixed soaking.
Third, to strengthen seedbed management: sowing density should not be too large, pay attention to seedlings and sub-seedlings, do a good job of insulation, adequate base fertilizer, manure should be fully decomposed. Can not flood irrigation, so as to avoid excessive moisture seedbed. If the humidity of the seedbed is relatively large and ventilation is allowed under the conditions permitting, the dry soil or ash may be used to reduce the humidity. And timely removal of diseased seedlings to prevent spread.
Fourth, the chemical control: After the discovery of diseased seedlings in a timely manner and spray control. You can use 25% of Rhizoctonia WP 500-800 times, 75% of WP 600 times, spray once every 5-8 days, spray 2 - 3 times.
Gray mold:
First, the ecological control: Protected cultivation is mainly to control the shed room temperature humidity. Normally late in the morning, the air is released late in the morning. When the temperature in the booth drops to 25°C, the air is released at noon. In the afternoon, the temperature is maintained at 20-25°C. When the temperature reaches 20°C, the air is stopped to keep the temperature at 15°C. - Between 17°C, open ventilation vents on cloudy days. Strengthen the cultivation and management, apply enough base fertilizer when planting and transplanting, avoid watering in rainy days, and put out dampness after watering. Whether it is protected land or open field, watering should be controlled. The diseased fruit and diseased leaves should be removed and disposed in a timely manner. After the disease is pulled, the diseased body should be removed and the agricultural operation should be performed to prevent the disease.
Second, drug control: focus on grasping the transplant before, flowering and fruit expansion of the three key drugs.
Before the transplanting, the seedlings were sprayed with 50% SuoQing wettable powder 1500-2000 times or 50% carbendazim or 500 times wet powder.
After the colonization, dip and dip the flowers and apply the drug, that is, add 0.1% of 50% acetaminophen wettable powder or 50% carbendazim WP or 0.2%-0.3% to the well-prepared 2.4-D or anti-droplet diluent. 25% Metalaxyl WP is applied or smeared. In recent years, the single use of "Panguo Ling No. 1" WP has achieved good results, that is, 0.5 liter of water per gram is fully stirred, and the flower is cooled after cooling.
The fruit inducer is applied before or at the onset of watering. The spray can be used 50% fast-king WP 2000 times; 50% acetaminophen wettable powder 1500 times; 60% anti-mild treasure ultra-fine powder 600 times; 45% thiabendazole suspension 4000 times; 25% Wuyimycin aqueous solution 150 times; 50% Nongliling WP 500 times.
Smoke application in the protected area can be selected from 10% fast-kerosenic smoke or 45% chlorothalonil smoke agent, 250 grams per acre; 3% thiabendazole smoke agent, 250 grams per acre.
Blight:
First, seedlings treatment can refer to damping-off.
2. Seed treatment: Use 0.3% of the seed weight for 40% of the seed dressing or 50% of the thiram for seed dressing.
Third, to strengthen the seedbed management: pay attention to increase the temperature, scientific ventilation, to prevent the emergence of high temperature and humidity seedbed.
Fourth, the chemical control: the initial incidence of spraying 50% Li Bingjing WP 800 times, 36% Thiophanate Suspension 500 times, or 70% Mancozeb WP 600 times or 5% Jinggangmycin agent 1500 times liquid. When damping-off and blight are mixed, it can be sprayed with 50% of Fairchild's double wettable powder 800 times, 2 to 3 liters per square meter, 7 to 10 days, and 2 to 3 consecutive times.
Late blight:
First, agricultural control: selection of disease-resistant varieties, this one can refer to the instructions on the seed packaging; with non-solanum crops for more than three years of rotation; strengthen fertilizer management, watering on sunny days and prevent flooding irrigation, timely ventilation after protection land watering Fertilize the base fertilizer and use formula fertilization; reasonably close planting, timely pruning, improve the ventilation and light transmission conditions; timely remove the central diseased plant.
Second, the chemical control: After the discovery of central disease strains, the effect of timely application of pesticides is good.
Spray application can use 40% Phytoncide WP 250 times, 58% metalaxyl MnZn WP 500 times, 64% WP WP 500%, 72% urea MnZn (DuPont) Kelu) WP 800 times, 69% AZM wettable powder 1000 times.
The dust can be applied within the landfill: 5% cream urea Mn-Zn dust can be used for every 1 kg of chlorothalonil dust, 5% chlorothalonil dust, and 1 kg for each mu. The pesticide is applied before the shed is closed in the evening. can. 7- 8 days once, 3 - 4 times in a row.
Smoke application can use 45% chlorothalonil smoke agent 250g/mu times, apply in the evening and close the shed.
Irrigation can be applied with 50% methicone wettable powder 600 times, 60% sulfone, ethyl aluminum phosphate wettable powder 400 times, 300 grams per strain can be about irrigated.
Physiological diseases
First, the surface should be flat, no flood irrigation. In a rainy season, it should be timely and airy.
Second, you can use solar energy greenhouse or electric hotline nursery: to strengthen the management of bed temperature, control the seedbed temperature above 15 °C. After the occurrence of a slight rooting, the soil must be loosened and the ground temperature raised. After the new root grows, it will be transferred to normal management.