According to the news from the National Agricultural Technology Extension Service Center, the late rice in South China is at the booting stage, and the single-season rice in the late rice in the south of the Yangtze River and the middle and lower reaches of the Yangtze River is in the heading and flowering stage. The "two-shift" pests were generally mild to moderate, and the rice leaf roller was found to be heavier in the local rice region of the lower reaches of the Yangtze River; the panicle neck stalks appeared in the south and middle and lower reaches of the Yangtze River; the southern rice black-streaked dwarf disease The local fields in the coastal and northwestern parts of Guangxi are heavier. According to the National Meteorological Center, there is a clear rainfall process in southern South China and the eastern part of the south of the Yangtze River, which is conducive to the relocation of the two-shifted pests and the further expansion of the disease.
According to the forecast, the rice leaf roller is generally light to moderate, and the local rice area in the lower reaches of the Yangtze River is biased. The current area is 77.38 million mu, which is the same as that of the same period of last year. The rice planthoppers are generally light to moderate, with an area of ​​90.73 million mu, an increase of 1.4% year-on-year. The stem borer occurs in the middle and lower reaches of the Yangtze River and the middle and lower reaches of the Yangtze River. The current area is 48.94 million mu, an increase of 8.5%. Sheath blight is occurring in the middle and lower reaches of the South China, Jiangnan and the Yangtze River. The current area is 104 million mu, an increase of 11.3%. Rice blast disease is generally mild, and some susceptible varieties occur heavily. The current area is 12.24 million mu, which is 2.4 times that of the same period of last year.
According to the National Meteorological Center, there will be obvious rainfall in the south of South China and the eastern part of the south of the Yangtze River. The cumulative rainfall is more than 30% to 70% compared with the same period of the previous year, which is conducive to the relocation of the two-shifted pests and the further expansion of rice diseases. All localities need to adapt to local conditions, check and repair, and do "the autumn grain is not enough for one day, and the prevention and control will not relax for one day", and strive for the harvest of autumn grain. (Zhong Xin)
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Current occurrence of diseases and insect pests in late rice
First, the rice planthoppers are generally mild to moderate. In mid-September, the South China and Jiangnan rice areas monitored obvious relocation peaks; according to the national 172 monitoring stations, the average number of single-light traps was 1,412, a year-on-year decrease of 12.8%; among them, brown planthoppers accounted for 63.5%, down 1.3 points year-on-year. percentage point. The amount of insects in the field increased. The amount of late-season rice in the south, south of the Yangtze River and the middle reaches of the Yangtze River was generally 200-600, 800-1500 high, and the local leakage prevention field exceeded 10,000; the single-season rice area in the lower reaches of the Yangtze River was 10~100. , 200 to 400 high, 1172 in Jianhu, Jiangsu.
Second, the rice leaf roller is generally light to moderate, and the local rice region in the lower reaches of the Yangtze River is biased. In mid-September, the mid-stream and the southeast coast of the Yangtze River monitored the relocation peaks. The peak period was long and the moths were high. According to the monitoring statistics, the average single-light moth was 331, which was 3.1 times that of the same period of last year. In the south of South China and the south of the Yangtze River, the number of moths is 50-500, and the height is 600-1000. The number of moths in the eastern part of the Yangtze River and the middle and lower reaches of the Yangtze River is 200-800, and the area along the Yangtze River in Jiangsu is as high as 2000-6000. Jiangxi's new construction is over 10,000 heads. The amount of eggs in the field is “substantially increased by the northâ€. The larvae of the South China rice area are 2,500 to 4,500, and the southwestern part of Guangxi and the western part of Guangdong have 10,000 to 30,000 heads. The number of larvae in the middle and lower reaches of the Yangtze River and the middle and lower reaches of the Yangtze River is 500~2500, and the height is 3000~5000. In some areas, the egg volume is higher. The northern part of Zhejiang, the northwestern part of Jiangsu, and the southern part of Jiangsu have a high number of eggs of 10,000 to 30,000. Zhejiang The highest part of Zhangzhou is 116,000.
The rice areas in the south and lower reaches of the Yangtze River and the Yangtze River are generally moderately occurring. The southern part of the south of the Yangtze River has entered the four-generation larvae hatching period. The northern part of the Yangtze River and the middle and lower reaches of the Yangtze River have successively entered the third generation of adults. The amount of larvae in the field is generally 120-750 heads, 1000-3000 heads high, and 7000~9500 heads in Hunan Changning, Zhuzhou, Shaodong, Fuyang and Jiangxi Yongxiu. The rate of heart failure caused by damage in the field is generally 0.1% to 2%, and the high rate is 2.4% to 6.7%. The rate of heart failure in the local area of ​​Chongyang in Hubei is as high as 50%.
Fourth, the sheath blight disease South China, Jiangnan and the middle and lower reaches of the Yangtze River are heavily weighted, the current area of ​​104 million mu, an increase of 11.3%. Due to the recent rainfall, the sheath blight has a rapid expansion rate in the middle reaches of South China, Jiangnan and the Yangtze River. The disease rate is generally 5%~20%, and the high is 20%~50%. It is part of the coastal and southeastern parts of Guangxi and the southwestern part of the Yangtze River. Up to 60% to 95%; the disease in the lower reaches of the Yangtze River is basically stable, the disease rate is generally 10% to 35%, and the high is 40% to 60%.
5. Rice blast is generally mild, and some susceptible varieties are biased. The leaf disease rate of rice in the middle and lower reaches of South China, Jiangnan and the Yangtze River is 0.1%~2%, and the high is 6%~20%. The leakage prevention field in Guangdong and Hubei is as high as 40%~60%. The rate of diseased ear in the middle and lower reaches of the Yangtze River and the Yangtze River is generally 0.1%~1.5%, and that of the Yongxiu, Jiangsu Gaochun and Hubei Hong'an local leakage prevention fields are 10%, 18.4%, and 76.3%.
Sixth, southern rice black-streaked dwarf disease South China and Jiangnan rice area is light. The disease rate in South China is 1%~5%, 40%~100% in Guangxi coastal area and northwestern part; the disease rate in Jiangnan rice area is generally 0.1%~3.3%, Jiangxi surplus is 5.6%, and local is as high as 12%.
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