Dry arid seedlings are commonly used as a means of raising rice in rice production. However, in the actual operation, the occurrence of blight is the most annoying issue for grain farmers. Because blight is the most common and most likely cause of devastating disasters in the production of dry seedlings. It is a contagious disease caused by fungi. The occurrence of this disease ultimately causes grain farmers to reduce the number of seedlings, reduce their quality, and even cause them to die, affecting rice production. 1. Causes of Blight The causes and symptoms of Blight. There are three main causes of blight. The first is that the seeds carry bacteria or the trampoline carries bacteria, and the disinfection of seed or bed soil is not thorough, which leads to the emergence of blight; Second, low temperature, early sowing, weak seedling growth, easy to infect blight; Third, the alkaline soil , pH value is greater than 6.5, and no acid or acid adjustment is not appropriate, the most likely to cause the proliferation of Pythium, so that the seedlings infected, blight occurs. The main symptoms of blight are: seedlings withered after emergence, easy to pull off, stem base rot, rotten pear flavor, into a film death, the majority of diseased plants have long red base moldy material. Second, control measures 1, seed treatment. Use 46% virulent 30g water 15kg, stir and soak 12kg rice seed, soaking at room temperature for 5 days, stirring once a day; with 15% soaking spirit 5ml or 35% baweiling 100ml to water 25 kg, soaking seeds for 5-7 days, stirring once a day; using 50% of thiram 50g, mixed with 10 kg of rice, have better disinfection effect. 2, soil disinfection. Soil disinfection is an indispensable and important measure in the work of drought and breeding. In the case of preparatory work, 70% of the enemy's 2.5 grams of rice was used before sowing and the spray was disinfected with 600 times of liquid. On a trampoline, after sowing a fine cover of soil, use 70% of the enemy's 1 g of Dixon per square meter, disinfect the 600 times of liquid spray, and pour water once each time after spraying so that the liquid can fully integrate with the soil. In order to kill the bacteria in the soil. In addition, 70% of the enemy can also be used for 2.5 grams per square meter, mixed with fine soil 7.5 kilograms and then mixed with the farmyard fertilizer on the seedbed, and then with the bed surface 10 cm thick layer of stirring for many times, fully mix, Sow after sowing water. 3, soil acidity. The optimum pH value of soil in the dry nursery was 4.5-5.5. Over-acid and alkali were not conducive to the growth and development of seedling roots. If the pH value of the trampoline soil is greater than 6.5, it should be acidified. The method of acid adjustment is to spray pickling water 2 days before sowing to adjust the acid; 50 grams of industrial sulfuric acid can be poured per square meter. Mix 200 times in clean water and evenly spray on the seedbed. If the pH is too high, increase the amount of diluted sulfuric acid solution. Then mix the pears with the topsoil and finally make the pH of the soil reach the required range. In order to avoid or reduce the acid adjustment process, suitable soil should be selected when selecting the soil. If the conditions are not fully met, as long as the pH value of the soil is between 4.0 and 6.5, the soil can be normally cultivated. The soil pH in the experiment is within this range. The difference in the growth of seedlings is not obvious. 4, pharmaceutical control. Blight still has to be controlled with chemicals, and the control time is 12-15 days after sowing. This period of control cannot be advanced or delayed. Application of pesticides during this period is very important for the control of blight. The application method is: 1 g of 70% dikeson plus 5 kg of soil or fine sand per square meter of boring machine. Mix evenly and spread it on a gong bed. Pour water once. In the management of barnyardgrass, if blight is still found, use 1.5 g of 70% dikone to spray 600 times per square meter, or 20% of tolclofosin EC 50 ml to spray 40 kg of water. Square meter on a trampoline.
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