First, the symptom identification 1, squatting disease. The disease is caused by the protozoa of the pathogen, tomato, cucumber. The seedlings of sweet pepper, eggplant, lettuce and other vegetable seedlings are mostly on the nursery bed. Before the soil is unearthed, the disease can cause rotten seeds. Rotten buds: the seedlings are damaged after being unearthed, and the water-soaked dark green lesions appear at the base of the stem, spreading around the young stems, and the lesions become Brown and contracted in a linear shape, the diseased plants collapsed, and sometimes the cotyledons did not wilted and fell to the ground. The onset often starts from the drip of the roof and gradually expands outward. When the humidity is high, the pieces fall down and the white flocculent hyphae grow on the surface of the seedling.
2, the blight. Caused by the pathogenic fungus Rhizoctonia, eggplant, tomato, cucumber, beet, lettuce, celery and other seedlings are vulnerable when unearthed, and begin to produce oval-shaped brown pitted lesions on the stem base 09. The leaves are wilting during the early day and recover at night. When the spot expands around the stem for 1 week, the seedlings begin to dry, but stand up without falling. When the humidity is high, the diseased part produces brown seedlings.
3. Gray mold. Infected by the pathogenic fungus Botrytis cinerea, gray mold is mainly caused by serious disease in the flowering stage, but it is easy to develop in the case of low temperature and high humidity after emergence of vegetables. This disease is a seedling disease that is often encountered in vegetable seedlings. It is often the first to infect gray mold in the case of excessive watering or dripping at the ceiling. It appears that the leaves begin to appear on the ground near the ground, initially appearing on the leaves or young stems. Dip-like chlorotic spots, when the humidity is high, gray mold can appear on the lesions, and further development can cause the leaves or young stems to rot, causing the seedlings to die.
4, roots. Alfalfa root is a common disease in the nursery stage, mainly due to low temperature (generally lower than 12 °C) seedling development hindered, no new roots in the roots, root bark began to produce rust spots, root rot, roots wilting, seedlings are easy to pull up, leaves The edge is dry and the coke is dead. The conditions that are easy to induce the above-mentioned diseases are: lack of sunshine in the cold season or rainy days during the nursery period, and poor growth of the seedlings, especially in the protected areas of continuous cropping for many years, due to the accumulation of more bacteria, it is most likely to cause serious disease in the seedling stage. In addition, extensive management, poor seedling insulation performance, improper ventilation, and weak seedlings are also susceptible to disease.
Second, the prevention and control of seedling disease 1, seed treatment with green Heng Tianbao 1500 times liquid soaking seeds, do not need soaking seeds can be wet spray on the surface of the seeds while spraying and mixing, fully mix, soak seeds until the seeds can increase the germination rate Promote hair roots, enhance the ability of seedlings to resist cold, and prevent roots. For the amount of pesticide seed dressing, use 1 to 1.50 grams of green Heng 1 for every 2 kilograms of seeds, or 3-4 grams with green Heng 2 . There are two kinds of seed dressing methods: dry mixing. After mixing the medicinal agent with a small amount of sieved fine soil, add the seeds and mix well. Wet mix. Wet the seeds evenly with a small amount of water, then add the required amount and mix well. It is best to use seed dressing barrels for seed dressing. The amount of seed dressing should not exceed half a barrel, 20-30 turns per minute, and 50-60 times each time. Mix well and mix immediately after sowing. No need to stuff.
2. Mulch soil disinfection. 1 gram per square meter with Greenheng No.1, 3000 times water, spray evenly in the bed, or 1 gram of green hengyi No. 1 to 15-20 kg of fine soil, 1/3 in the bed, the remaining 2/ 3 cover the soil after sowing.
3. Disinfection of nutrient soil. In areas where planting diseases have been severely affected for many years, the nutrient soil used for seedling cultivation should be thoroughly disinfected. Greenheng No.1 is sprayed on the nutrient soil evenly at a rate of 3,000 times per cubic meter of water, mixed well and then planted in a pot or seedling tray. After the emergence of the seedlings, it is necessary to strengthen the management. Before the transplanting, the green hunger No. 1 is sprayed once with 3000 times, and the disease prevention effect at the seedling stage is better.
4. Spray or fill the roots. In the early stage of seedling disease or when the dead seedlings have been seen, the soil can be sprayed or rooted with Greenheng No.1 3000-4000 times or Luning No.2 600 times liquid, which can effectively inhibit the further expansion of the disease.
5. Strengthen management. After seed treatment and seedling soil sterilized and sown seedlings, it is also necessary to pay attention to seedling management. In the protected ground shed, it is necessary to release the wind in time to reduce the humidity. Beware of the seedlings, it is best to use sorghum seedlings to prevent water in the seedbed; It is necessary to water less and work hard.
2, the blight. Caused by the pathogenic fungus Rhizoctonia, eggplant, tomato, cucumber, beet, lettuce, celery and other seedlings are vulnerable when unearthed, and begin to produce oval-shaped brown pitted lesions on the stem base 09. The leaves are wilting during the early day and recover at night. When the spot expands around the stem for 1 week, the seedlings begin to dry, but stand up without falling. When the humidity is high, the diseased part produces brown seedlings.
3. Gray mold. Infected by the pathogenic fungus Botrytis cinerea, gray mold is mainly caused by serious disease in the flowering stage, but it is easy to develop in the case of low temperature and high humidity after emergence of vegetables. This disease is a seedling disease that is often encountered in vegetable seedlings. It is often the first to infect gray mold in the case of excessive watering or dripping at the ceiling. It appears that the leaves begin to appear on the ground near the ground, initially appearing on the leaves or young stems. Dip-like chlorotic spots, when the humidity is high, gray mold can appear on the lesions, and further development can cause the leaves or young stems to rot, causing the seedlings to die.
4, roots. Alfalfa root is a common disease in the nursery stage, mainly due to low temperature (generally lower than 12 °C) seedling development hindered, no new roots in the roots, root bark began to produce rust spots, root rot, roots wilting, seedlings are easy to pull up, leaves The edge is dry and the coke is dead. The conditions that are easy to induce the above-mentioned diseases are: lack of sunshine in the cold season or rainy days during the nursery period, and poor growth of the seedlings, especially in the protected areas of continuous cropping for many years, due to the accumulation of more bacteria, it is most likely to cause serious disease in the seedling stage. In addition, extensive management, poor seedling insulation performance, improper ventilation, and weak seedlings are also susceptible to disease.
Second, the prevention and control of seedling disease 1, seed treatment with green Heng Tianbao 1500 times liquid soaking seeds, do not need soaking seeds can be wet spray on the surface of the seeds while spraying and mixing, fully mix, soak seeds until the seeds can increase the germination rate Promote hair roots, enhance the ability of seedlings to resist cold, and prevent roots. For the amount of pesticide seed dressing, use 1 to 1.50 grams of green Heng 1 for every 2 kilograms of seeds, or 3-4 grams with green Heng 2 . There are two kinds of seed dressing methods: dry mixing. After mixing the medicinal agent with a small amount of sieved fine soil, add the seeds and mix well. Wet mix. Wet the seeds evenly with a small amount of water, then add the required amount and mix well. It is best to use seed dressing barrels for seed dressing. The amount of seed dressing should not exceed half a barrel, 20-30 turns per minute, and 50-60 times each time. Mix well and mix immediately after sowing. No need to stuff.
2. Mulch soil disinfection. 1 gram per square meter with Greenheng No.1, 3000 times water, spray evenly in the bed, or 1 gram of green hengyi No. 1 to 15-20 kg of fine soil, 1/3 in the bed, the remaining 2/ 3 cover the soil after sowing.
3. Disinfection of nutrient soil. In areas where planting diseases have been severely affected for many years, the nutrient soil used for seedling cultivation should be thoroughly disinfected. Greenheng No.1 is sprayed on the nutrient soil evenly at a rate of 3,000 times per cubic meter of water, mixed well and then planted in a pot or seedling tray. After the emergence of the seedlings, it is necessary to strengthen the management. Before the transplanting, the green hunger No. 1 is sprayed once with 3000 times, and the disease prevention effect at the seedling stage is better.
4. Spray or fill the roots. In the early stage of seedling disease or when the dead seedlings have been seen, the soil can be sprayed or rooted with Greenheng No.1 3000-4000 times or Luning No.2 600 times liquid, which can effectively inhibit the further expansion of the disease.
5. Strengthen management. After seed treatment and seedling soil sterilized and sown seedlings, it is also necessary to pay attention to seedling management. In the protected ground shed, it is necessary to release the wind in time to reduce the humidity. Beware of the seedlings, it is best to use sorghum seedlings to prevent water in the seedbed; It is necessary to water less and work hard.
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