Field identification and control of rice bakanae disease
Rice bakanae disease is one of the main diseases of rice production. The damaged rice plant withered or died before heading, and generally does not produce heading and fruiting, so it is commonly known as “public moneyâ€. Its identification method and control measures are as follows:
First, the characteristics of the disease. Rice bastard disease is mainly composed of bacteria-carrying seeds, followed by sick grass as the initial infestation source for the second year. Infestation of pathogenic bacteria is generally carried out at the time of sowing. During sowing, hyphae or conidia that lurk on the diseased species germinate in water, from the wound. Invading to the base of the seedlings causes the onset of rice seedlings, and diseased rice straw can also cause disease when used to cover pods and bundles of pods.
Second, the incidence conditions. Seeding diseased seeds that have not been sterilized by medicaments can easily cause morbidity. Diseased seeds and seedlings are mechanically damaged, which can aggravate the disease.
Third, the harm symptoms. Bakanae disease may occur from the seedling stage to the heading stage. The incidence of field crops usually occurs after a few days of sowing, and some sprouts die shortly afterwards. However, typical symptoms must be exhibited at the end of Putian: To be much thinner, and grow taller, the color is yellowish green. Most of the diseased seedlings died before they were transplanted, and the reddish moldy material appeared from the near-ground part of the dead seedlings, and some appeared white. Daejeon's disease: The diseased strain appeared only about one month after transplanting. The initial symptoms were the same as those of the seedlings. When the disease was severe, it usually died before heading. In the late stage, there are usually many black spots on the lower part of the diseased plant, near the stem, or on the leaf sheath.
Fourth, the symptoms. In the tillering period of rice, the diseased plant is 2/3 higher than that of the healthy plant, yellow-green, and the leaves are drape, and the roots appear on the nodes. The peasants were also called rice bran, public gong, standard gong and standard hut. The diseased seedlings subsequently turned yellow and gradually died.
V. Prevention methods
1, to deal with sick grass, sick valley, do a good job of seed disinfection.
2, diseased strains pulled out in a timely manner to reduce the re-infection source.
3. Use 25% cyanogenin suspension agent to soak seeds in 3000 times solution. The ratio of rice seed to medicine liquid is 1:1.2. The temperature is controlled at 15~20°C. Generally soaked for 2 days. After soaking, direct germination is required. The soaking with this medicine has no adverse effect on the growth and development of rice during the whole growth period. It is safe and non-phytotoxic and has good control effect on rice bakanae disease. The control effect at seedling stage is 100%, and the control effect at the end of tillering is 96.99~100. %, heading control effect is 76.05~98.86%.
First, the characteristics of the disease. Rice bastard disease is mainly composed of bacteria-carrying seeds, followed by sick grass as the initial infestation source for the second year. Infestation of pathogenic bacteria is generally carried out at the time of sowing. During sowing, hyphae or conidia that lurk on the diseased species germinate in water, from the wound. Invading to the base of the seedlings causes the onset of rice seedlings, and diseased rice straw can also cause disease when used to cover pods and bundles of pods.
Second, the incidence conditions. Seeding diseased seeds that have not been sterilized by medicaments can easily cause morbidity. Diseased seeds and seedlings are mechanically damaged, which can aggravate the disease.
Third, the harm symptoms. Bakanae disease may occur from the seedling stage to the heading stage. The incidence of field crops usually occurs after a few days of sowing, and some sprouts die shortly afterwards. However, typical symptoms must be exhibited at the end of Putian: To be much thinner, and grow taller, the color is yellowish green. Most of the diseased seedlings died before they were transplanted, and the reddish moldy material appeared from the near-ground part of the dead seedlings, and some appeared white. Daejeon's disease: The diseased strain appeared only about one month after transplanting. The initial symptoms were the same as those of the seedlings. When the disease was severe, it usually died before heading. In the late stage, there are usually many black spots on the lower part of the diseased plant, near the stem, or on the leaf sheath.
Fourth, the symptoms. In the tillering period of rice, the diseased plant is 2/3 higher than that of the healthy plant, yellow-green, and the leaves are drape, and the roots appear on the nodes. The peasants were also called rice bran, public gong, standard gong and standard hut. The diseased seedlings subsequently turned yellow and gradually died.
V. Prevention methods
1, to deal with sick grass, sick valley, do a good job of seed disinfection.
2, diseased strains pulled out in a timely manner to reduce the re-infection source.
3. Use 25% cyanogenin suspension agent to soak seeds in 3000 times solution. The ratio of rice seed to medicine liquid is 1:1.2. The temperature is controlled at 15~20°C. Generally soaked for 2 days. After soaking, direct germination is required. The soaking with this medicine has no adverse effect on the growth and development of rice during the whole growth period. It is safe and non-phytotoxic and has good control effect on rice bakanae disease. The control effect at seedling stage is 100%, and the control effect at the end of tillering is 96.99~100. %, heading control effect is 76.05~98.86%.
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