Causes of Blight
Bed soil disinfection before seedling planting was not thorough, the temperature inside the greenhouse was high, and the humidity was high. The viable bacteria were rapidly propagated and the roots of the infested rice seedlings caused the disease. This is fungal blight. Because of the high temperature, high humidity, and poor light transmission, rice seedlings have long stems and leaves, poor roots, and poor water absorption capacity. They have encountered improper ventilation, excessive water loss, and unbalanced moisture in rice seedlings, causing wilting. Physiological bacterial wilt. Before the 3rd leaf stage of rice seedlings, disease resistance was weak and it was very easy to infect these two diseases. Especially for bacterial wilt, the disinfectant used in the early stage of nursery has no control effect on it. Once it is onset, it shows a continuous sheet and basically loses its utility value.
Identification of seedling blight
During the 1.5 to 3 leaf stage of rice seedlings, the yellow leaves of the rice seedlings were yellow, the leaves did not spread out, the bases became brown, brown spots appeared on the leaf sheaths, and the roots turned yellow-brown. There is a layer of fungus at the junction of seed and seedling stem base, and the stem base is soft rot and easily broken. Cluster-like spots occur on the seedbeds. This is the initial symptom of fungal blight. Control is late, and it will soon spread to the entire seedbed. Before and after the three-leaf stage of rice seedlings, the tip of rice seedlings was not spit-out and there was no water droplets. When the weather was fine, the rice seedlings quickly showed blue and dry, and the heart and upper leaves were “hiccupedâ€, and the seedlings turned green and wilted. This is the early and mid-term symptom of physiological bacterial wilt. In the seedbed, it was even flaky, but it was not contagious. For those who have the above initial symptoms, they should immediately take the second preventive measure to control the disease. Wherever conditions permit, no matter whether the seedbed will develop or not, spraying prevention will be carried out in the 1.5 to 2.5 leaf stage of rice seedlings, and the effect will be better and more secure.
New technologies for prevention
Select 1000 times of 30% 5% water solution of the biological pesticides that can cure both blights. In the 1.5 to 3 leaf stage of rice seedlings, spray the liquid 2 to 3 kg/m2. The liquid can be poured onto the seedlings and moisten the bed soil, which not only enhances the immunity of the rice seedlings but also kills the damp-broom fungus in the bed soil. This method can be combined with seedbed replenishing. The drug is a chitin biopesticide, in fact, non-toxic grade, suitable for pollution-free rice, A-level green food rice, AA-level organic rice use. Under normal circumstances, only spray with a fine hole sprayer once, such as spraying again after 10 days better. Spraying one meter per square meter of seedbed is about more than one dime, which is economical and has good preventive effect. It is a new technique for preventing blight. According to scientific research, chitin biopesticides, which are well-known inducers, have bactericidal action and promote rapid rooting, so they have a good effect of preventing blight and bacterial wilt. Tests have shown that both rice transplants reduce the effects of rice leaf spot disease, bacterial brown spot disease, rice blast, and rapae blight.
Nuts can generally be divided into two types: one is seeds, such as sunflower seeds, pumpkin seeds, peanuts, etc.; the other is tree nuts, such as pistachios, hazelnuts, cashews, walnuts, pine nuts, walnuts, chestnuts, almonds. And the macadamia and pecans that have been very hot in the past two years. These nut foods contain more protein, calcium and a variety of vitamins, which can provide the body with a variety of nutrients needed by the brain and body.
In general, a nut is a closed fruit classification of a nutrient-covered woody or leathery hard shell. The skin is hard and contains one or more seeds. It includes two types of tree nuts and fruit seeds, walnuts, chestnuts, pistachios, almonds, etc., melon seeds, which belong to the fruit seed class.
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