Medicine Cabinet,Hospital Medicine Cabinet,Detachable Medicine Cabinet,Practical Medicine Cabinet NANJING TIANAO MEDICAL INSTRUMENTS MANUFACTURE CO.,LTD. , https://www.tianaomedical.com
First, identify disease symptoms
1, tripping disease. The disease is caused by the fungal Pythium, tomato and cucumber. The incidence of vegetable seedlings such as sweet peppers, eggplants and lettuce is mostly on nursery beds. Infestation before harvesting can cause bad seeds, bad shoots: seedlings are injured after emergence, and water-soaked dark green lesions appear at the base of the stem, around the young stems, lesions change. The brown and contracture was linear and the diseased seedlings were folded. Sometimes the cotyledons did not fall into the ground. The onset often starts from the dripping at the roof and gradually expands outward. When the humidity is high, the pods fall down and white flocculent mycelium grows on and near the diseased seedlings.
2, blight. Caused by the pathogenic fungi Rhizoctonia, eggplant, tomato, cucumber, beet, lettuce, celery, and other seedlings are vulnerable when unearthed. They begin to produce oval brown depressions on the stem base, wilting early in the day and recovering at night. When the stem is enlarged for 1 week, the seedlings begin to dry, but they do not fall. When the humidity is high, the diseased part produces brown seedlings.
3, gray mold. Caused by the infection of pathogenic fungal strains of Botrytis cinerea, the incidence of gray mold is mainly severe in the fruiting period of flowering, but it is also susceptible to disease if the condition of low temperature and high humidity occurs after the emergence of vegetables. This disease is a seedling disease often encountered in vegetable nursery. It is often the earliest infection of gray mold in watering or roof drip, manifested as the onset of the disease on the leaf near the ground, initially appeared on the leaves or young stems Dipping chlorotic spots, in the humidity, lesions may appear gray moldy, further development can cause leaf or young stem rot, resulting in seedling death.
4, root disease. The root is a common disease during seedling stage, mainly due to the impeded seedling development at low temperature (generally below 12°C), no new roots at the root, rust spots on the root bark, rot in the roots, wilting in the ground, seedlings are easy to pull up, leaves The edge is dry, and when it is severe, it will die and die.
The conditions that can easily induce the above diseases are: lack of sunshine in the cold period or rainy days during the nursery period, poor seedling growth, and especially the protected plots for many years of continuous cropping, which are most likely to cause serious disease at the seedling stage due to more accumulated bacteria. In addition, the management of extensive seedlings, poor insulation performance, improper ventilation and ventilation, seedlings grow weak seedlings are also susceptible to disease.
Second, seedling disease prevention and treatment
1. Seed treatment: Seeds are seeded with 50% carbendazim or 2.5% Celestium or 50% thiram and the amount is 0.3-0.4% of the seed amount. When the dry mix is ​​mixed with a small amount of sifting fine soil, add the seeds and mix well. When wet mixing, use a small amount of water to evenly moisten the seeds, then add the required amount of drug and mix well. Seed dressing is best to use seed dressing bucket, each time the amount of seed dressing does not exceed half a barrel, fully mix, mix immediately after sowing, without boring species. It can also be soaked with 1500 times liquid of Hengchang Tianbao, so that the seeds can be soaked, it can increase the germination rate, promote hair root, enhance the cold resistance of the seedlings, and prevent the roots from sowing.
2, Miao soil disinfection. Use 50% Dixon 6 -8 g/100 kg soil, mix thoroughly and make clay. Use 72.2% Prec 800 times solution or 50% dexamethasone 800 times solution 2 -3L/m2 seedbed for irrigation. In places where the disease of the seedling stage is serious when growing vegetables for many years, the nutritious soil for nursery should be thoroughly disinfected. On the 1st of Green Luheng, 1.50 g/m3 is sprayed on the nutritious soil 3000 times as much as the water. Mix it and put it on the pot or seedling plate for further sowing. After the emergence of seedlings, it is necessary to intensify management. Before transplanting, it is sprayed once more with a 3000 times solution of Green Hunter No. 1 to prevent and treat disease at the seedling stage.
3, spray protection. In the early stage of seedling disease (when a small amount of diseased seedlings has been found), the diseased plant should be removed in time, and a small amount of dry soil or ash should be used for dehumidification. 75% chlorothalonil 800 times solution or 75% thiophanate-methyl 1000 can be used for chemical control. Double liquid or 25% Amisida 1500 times spray control. It is also possible to use Green Hunter No. 1 3000-4000 times or Green Ning No. 2 600 times for soil spraying or rooting, which can effectively inhibit the further expansion of the disease.
4, strengthen management. After seed treatment and seedbed soil disinfection seedlings unearthed after sowing, but also pay attention to the management of seedling stage, in the warm greenhouse to promptly release the air, reduce humidity, beware of seedlings grow long; at the same time less watering early, diligent cultivator.
Adopting various comprehensive prevention and control measures can not only effectively prevent and control diseases at the seedling stage, but also cultivate strong seedlings. This has laid a good foundation for improving the quality of vegetables, mentioning the morning market, and increasing the output and benefits.
Identification and Prevention of Vegetable Disease at Seedling Stage
Spring is a suitable period for sowing, nursery and open-field cultivation of various vegetables. In the stage of vegetable nursery and colonization, seedlings are vulnerable to seedling disease due to the instability of temperature in spring and the weather conditions of insufficient rain and light. Diseases at the seedling stage mainly include damping-off, blight, gray mold, and root disease. Therefore, adopting comprehensive prevention and control measures to prevent and control disease at seedling stage and fostering disease-free and strong seedlings are the basis for the quality and high yield of vegetables.