1. Climate: The hazards of rice blast are greatly affected by climate and fertilizer management. The relative humidity is above 90%. Especially when the temperature is between 24 and 28 degrees, it is most prone to outbreaks, and low temperature or volcanic heat is not easy to occur. Therefore, rice blast disease mostly occurs in the mountains and the rainy season. In the province from late May to early June, rice blast disease is prone to occur at the heading stage of early rice and from the end of June to the beginning of July (late rice is more popular from late September to early October).
2. Variety: Rice varieties have strong or weak resistance to rice blast. But not absolute. For example, the original high-resistance Zhefei 802 and the red cultivar will gradually be out of control after several years. This is because of the increased adaptability of fungi. Or it has differentiated into targeted physiological races. Therefore, the ward must be changed first.
3, fertilization: nitrogen fertilizer applied too much or too late to catch, leading to early madness, not yellow in the middle, late greediness, too fat and leaves are most susceptible to disease. In addition, after fertilization at the seedling stage or tillering stage, the formation of chlorogenic acid in the strains on sunny days results in good synthesis of cytoplasm, starch, and fiber; if the application is followed by cloudy rain, the photosynthetic activity is low, which is not conducive to the absorption and conversion of bacteria into protein. Therefore, accelerating appropriate application of P fertilizer can enhance cytoplasm concentration and increase resistance, while potash fertilizer and silicon fertilizer make plants thick and solid and stems and leaves strong, so that they can resist and limit the invasion of rice blast fungus.
4. Immersion: The seedlings of rice blast are mainly infected with the diseased grass in the grain or in the soaking. When the disease is suitable for the climate, the disease center should be immediately removed, destroyed or sprayed. The spread of the field leafhopper is 2 meters. The following high-level air flow or the rainy days of leaching of the fields to send pathogenic spores cause infection, so we must control the source of the disease. The precursory disease of the panicle-necked pheasant was found on the leaf blade of a few flag leaves or the next leaf of Daejeon, and the disease spots were looming. It was necessary to seize the opportunity to fight drugs, and it was too late to wait until the panicle pumping.
5, medication: The current commonly used pesticides for the control of rice blast is: soaking seed disinfection can be used l% of lime water, or 500 times the 402 liquid. In Daejeon, when the rate of diseased leaves in the upper leaves has reached four-thousandths, or the flag leaf disease rate reaches two-thousandths, or if the disease occurs in the leaves and leaves, it is necessary to fight drugs. The use of tricyclazole or Fuji No. 1, thiophanate-methyl, and gram per acre is available. Scattered EC, any of the above, the amount is 100 grams, watered 45 kg, evenly sprayed water.
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