Control measures for rice blight
Rice blight is the main disease of rice dry nursery, and it is a disease caused by soil fax bacteria. Mainly due to low temperature and humidity, large temperature difference, soil alkali, lack of light, excessive seeding, thin seedlings and other factors. There are different degrees of occurrence every year, which seriously affects the quality of rice seedlings and the increase of rice yield. Therefore, it is necessary to take comprehensive prevention and control measures based on prevention to prevent the occurrence and spread of rice blight. Rice blight can be divided into two types from the etiology, one is fungal blight, and the other is physiological blight, also known as bacterial wilt.
1. Fungal blight is an invasive disease caused by fungal damage. Due to incomplete disinfection of seeds or bed soil, combined with poor growth environment and improper management of seedlings, seedling growth is not robust, disease resistance is weakened, and virus is taken advantage of Invasion leads to morbidity. Fungal blight usually occurs before the three-leaf stage and the three-leaf stage. After the onset, the center of the disease appears first, then spreads rapidly and spreads into pieces. More than 50% of the dead are dead, and more forms of acne.
2, physiological blight is also known as bacterial wilt, due to poor external environmental conditions and improper management measures, so that seedling stems and leaves are long, root system is poorly developed, water physiological imbalance after ventilation and refining, root water absorption can not meet the needs of leaf transpiration The requirements of water make the leaves seriously dehydrated and cause physiological diseases. After the occurrence of the three leaves, the photosynthetic products accumulate in the leaves at the beginning of the disease, and the leaves are blue. In the middle of the disease, the leaves are waterless in the morning, and the leaves are rolled at noon. The heart leaves are rolled up, and the leaves return to normal in the morning and evening. . When you use a portable seedling, you can pull out the roots and form a piece or a bed on the seedbed.
Prevention and control of rice blight:
1. The seedbed soil is acid-disinfected. Use nutrient soil for the seedbed and apply according to the instructions. 2, sowing should not be too dense, so as not to produce weak seedlings: mastering the amount of seeding is a key part of cultivating dry seedlings and strong seedlings. The amount of seeding per square meter is preferably 3 and not more than half a catty. If the seeding is too dense, the seedlings are slender, the resistance is weakened, and the blight is susceptible, while the strong seedlings are more resistant and less susceptible to blight. 3, chemical control: one leaf, one heart to two leaves, one heart period, the most prone to the emergence of dead blight infecting dead seedlings, can be used as a yellow sorghum fast green 25 grams per bag plus water 3-5 kg ​​spray 66 square meters, or with 42% Dry one-time wettable powder 40g water 100-120kg poured on the seedbed; you can also use 35% dry or 42% to dry once in the initial stage of the disease 40 grams per bag with water 100 kg for foliar spray, Spray again once every 5-7 days, even spray 2 times. 4, to overcome the low temperature, so as not to induce the blight: sowing to emergence of seedlings to heat preservation; one leaf and one heart to control temperature and humidity, the film temperature is maintained at 25 ° C; one leaf and one heart, sunny day 10 am to afternoon At 4:30, the membrane was opened at 1-2 hours on cloudy days, and the membrane was ventilated in rainy days, but the temperature inside the membrane could not be lower than 12 °C, otherwise it would easily induce blight.
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