As a result of the cold air, rice in many plots generally suffer from blue and dry death. There was no water layer in the field and no rice planthoppers were found to be harmful. What is the cause of this and how to remedy it.
The rice planthoppers that damage rice in late rice growth in our province are mainly brown planthoppers. The sucking hazards of adult rice nymphs and nymph clusters at the base of the rice tussock cluster. When the juice is sucked, saliva secretes toxic substances, which not only consumes nutrients from the plants, but also inhibits the passage of water and nutrients from the body of the saliva, causing the grain to become full, reducing the grain weight, and increasing the grain size. When the amount of insects is large and the damage is heavy, the lower part of the rice plant often becomes black in the short term, and the rot becomes odor. This kind of harm often appears after the heading of rice, known as "simmering", commonly known as "eruption", "Tongtian" or "topping." Nilaparvata lugens is suitable for high temperature and high humidity. The suitable temperature for growth and development is 20-30°C, the optimum temperature is 26-28°C, and the suitable humidity is more than 80%. The unusually high temperature this summer has adversely affected rice planthoppers such as brown planthoppers. The recent cooling weather is also not conducive to the occurrence and harm of rice planthoppers. No rice planthoppers were found in the rice fields mentioned above. The death of rice was not related to rice planthoppers.
In our province, there was a large temperature drop on October 14-16. The average temperature dropped by nearly 10°C. On the 17th, the temperature began to warm. Funing County's maximum temperature dropped to 17°C on the 15th and the minimum temperature dropped to 8°C; on the 16th, the maximum temperature was 17°C and the minimum temperature was 11°C. The sudden drop in temperature and low temperature for several consecutive days will reduce the root activity of the rice in the field and weaken the ability to absorb water. After the weather is clear and the temperature rises, the rice leaves have a strong transpiration effect. The green rice leaves are deprived of water and the water requirement increases. The roots of the rice plants cannot absorb water or absorb water. As a result, the water supply of rice plants is in short supply, and physiological water loss occurs. Physiological blue-green rice usually occurs suddenly in a large area within 1 to 2 days. The rice plant suddenly died and appeared in a patchy form in the field. Green and dry rice leaves are wilting in the leaves, showing a grayish gray, no lesions; the stem base is shriveled and the plants are easy to fall; the hulls are grayish blue and form a valley; the roots are yellow or black. Poor rice roots with poor vitality and premature watering are prone to physiological blues.
There is no effective remedy after the occurrence of physiological blight in rice. Immediately filling with deep water when the rice begins to lose water can reduce the damage to a certain extent. In order to prevent the physiological blueness of rice, it is necessary to timely insulate deepwater in paddy field before cooling, which will help reduce the occurrence of blue-green. Spraying foliar fertilizer such as potassium dihydrogen phosphate and sodium nitroprusside in the early stage of rice filling, and maintaining the roots of the leaves, will help to enhance plant resistance and reduce occurrence of blue-green.
The rice planthoppers that damage rice in late rice growth in our province are mainly brown planthoppers. The sucking hazards of adult rice nymphs and nymph clusters at the base of the rice tussock cluster. When the juice is sucked, saliva secretes toxic substances, which not only consumes nutrients from the plants, but also inhibits the passage of water and nutrients from the body of the saliva, causing the grain to become full, reducing the grain weight, and increasing the grain size. When the amount of insects is large and the damage is heavy, the lower part of the rice plant often becomes black in the short term, and the rot becomes odor. This kind of harm often appears after the heading of rice, known as "simmering", commonly known as "eruption", "Tongtian" or "topping." Nilaparvata lugens is suitable for high temperature and high humidity. The suitable temperature for growth and development is 20-30°C, the optimum temperature is 26-28°C, and the suitable humidity is more than 80%. The unusually high temperature this summer has adversely affected rice planthoppers such as brown planthoppers. The recent cooling weather is also not conducive to the occurrence and harm of rice planthoppers. No rice planthoppers were found in the rice fields mentioned above. The death of rice was not related to rice planthoppers.
In our province, there was a large temperature drop on October 14-16. The average temperature dropped by nearly 10°C. On the 17th, the temperature began to warm. Funing County's maximum temperature dropped to 17°C on the 15th and the minimum temperature dropped to 8°C; on the 16th, the maximum temperature was 17°C and the minimum temperature was 11°C. The sudden drop in temperature and low temperature for several consecutive days will reduce the root activity of the rice in the field and weaken the ability to absorb water. After the weather is clear and the temperature rises, the rice leaves have a strong transpiration effect. The green rice leaves are deprived of water and the water requirement increases. The roots of the rice plants cannot absorb water or absorb water. As a result, the water supply of rice plants is in short supply, and physiological water loss occurs. Physiological blue-green rice usually occurs suddenly in a large area within 1 to 2 days. The rice plant suddenly died and appeared in a patchy form in the field. Green and dry rice leaves are wilting in the leaves, showing a grayish gray, no lesions; the stem base is shriveled and the plants are easy to fall; the hulls are grayish blue and form a valley; the roots are yellow or black. Poor rice roots with poor vitality and premature watering are prone to physiological blues.
There is no effective remedy after the occurrence of physiological blight in rice. Immediately filling with deep water when the rice begins to lose water can reduce the damage to a certain extent. In order to prevent the physiological blueness of rice, it is necessary to timely insulate deepwater in paddy field before cooling, which will help reduce the occurrence of blue-green. Spraying foliar fertilizer such as potassium dihydrogen phosphate and sodium nitroprusside in the early stage of rice filling, and maintaining the roots of the leaves, will help to enhance plant resistance and reduce occurrence of blue-green.
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