Rice rotten cockroaches are common in early spring low temperature years. In severe cases, not only the seeds are lost, but also the lack of cockroaches, delaying the farming time, delaying the planting period and affecting the yield.
Rice rotten rot disease is a general term for the death of rice seeds and seedlings in the field. There are two kinds of rotten cockroaches: physiological rotten cockroaches and invasive rotten cockroaches. Physiological rotten cockroaches refer to the symptoms of rotten seeds, rotten buds, black roots, green and dry, yellow withered, dead seedlings caused by adverse environmental conditions. Infectious rotten cockroaches refer to rice blight, cotton rot, and rice blast disease caused by cotton rot fungus, spoilage bacteria and Fusarium.
Control method:
1. Selected seed selection. Seeds with high purity and clean seeds, soaking seeds before soaking seeds, and improving the germination rate and vitality of seeds.
2. Make good and complete the Putian: Putian should choose the shelter from the wind, the terrain is high, the irrigation and drainage is convenient, and the fertility is moderate. The land preparation is to make the fine bed surface flat, the ditch deep, and the irrigation and drainage smooth.
3. Using film to raise seedlings. It is best to use the arch type perforated film to raise the cockroach, which can effectively solve the problem of low temperature causing rotten smashing.
4. Improve soaking and germination technology. When soaking seeds and germination, the temperature should be properly controlled. It is required to achieve 36-38 °C, white head, moderate temperature 30-35 °C stable germination, cool 20-25 °C thin and good buds, so that the seed buds reach Qi, even and strong.
5. Improve the quality of seeding. According to the characteristics of the variety, determine the sowing date, the amount of seeding and the age of the seedlings, it is required to deduct the rare sorghum, cultivate the sorghum and sorghum, and soak the grain with half of the grain.
6. Strengthen the management of fertilizer and water in Putian. Before sowing to the current bud, the main source of ventilation is oxygen supply. The surface of the shoal is kept moist, so that the roots are rooted and rooted. The two leaves and three leaves are mainly kept warm and anti-freeze, and shallow water can be used to prevent dead seedlings. After the 3 leaf period, you can take care of the water. 7-10 days after sowing , it is necessary to do five preventions, that is, to prevent low temperature, rainproof, high temperature burning seedlings, anti-tank drying, anti-smashing plate water, to achieve sunny day noon ventilation, refining seedlings full of ditch water, cloudy Covered with semi-ditch water. Drain the water after the rain. Rational fertilization, base fertilizer is suitable for the combination of decomposed human urine and phosphate fertilizer. The top dressing should be applied in different times. After the seedlings are applied, the “breaking roots and fertilizers†should be applied. In the 5th stage, the “weaning fertilizer†should be applied to promote the hair roots and leaves.
7. Chemical control. Seedlings and blight: When making the seesaw, use 70% dikes to dilute 1000 times per acre and spray to ensure that there is no blight in the 3 leaf stage.
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