The damping-off disease of Pinus bungeana seedlings is the most common and most serious disease occurring in nursery. PlantNet now introduces its control methods as follows.
The disease mostly occurs in rainy days and high humidity. The onset of seedlings suddenly fell to death, seriously affecting the survival rate of seedlings, or even destroying all seedlings. The prevention and treatment of these diseases should be based on the principle of prevention and multiple measures to achieve good results.
Garden selection is the foundation
Seedlings of Pinus bungeana are afraid of earthworms. Therefore, the flats with irrigation and drainage conditions should be selected for the nursery. Heavy clay land, saline-alkali land, and low-lying water areas should not be used as breeding grounds.
Seed and soil treatment are indispensable
Seeds should be soaked with Bordeaux mixture and soaked with warm water (50°C-60°C) before sowing to accumulate germination or accumulate sand to accumulate buds. Seeds can be sowed when the number of seeds reaches 50% of the total number of seeds. 2-4 weeks before soil preparation, apply 10 kg of ferrous sulfate powder or 2-4 kg of Keqingqing 3 per acre, and turn it into the soil for disinfection. The nursery area should be deepened and leveled, and the base fertilizer must be applied, such as decomposing circle fertilizer and compost.
The key to seedling management
After planting, shade will be covered to prevent sunburn. According to the condition of the seedlings, adequate ventilation will be provided in due course to avoid the occurrence of high temperature and humidity conditions. When watering is required, each time should not be excessive, and should be carried out in the morning; when the bed and soil humidity is high, 50-75 kg of sieved ash can be used per acre to spread, which can not only top-dress fertilizer, but also promote the development of seedling roots, and the seedling stems early. Lignification. The weeds in the nursery must be cleared early and the seedlings are too dense. The weeds should be combined with weeds in order to promote the vigorous growth of seedlings and increase the resistance to disease.
Chemical control must be timely
After the seedlings are unearthed, the same amount of Bordeaux mixture (copper sulfate: quicklime: water = 1:1:100) is sprayed every 5-7 days, and sprayed for 2-3 consecutive times. When knocking down was found, the diseased seedlings were immediately removed to prevent cross-infection. The first 3% of the water was used to irrigate the diseased seedlings around the seedlings, and 72.2% of Precike 600 times liquid and 1% of ferrous sulfate were used. Use it alternately and spray it once a week. When using ferrous sulfate solution, rinse the seedlings with clean water at the end of each spraying so as not to cause phytotoxicity.
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Shandong Shengli Bioengineering Co., Ltd , https://www.shenglipharm.com