At present, 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, in the next 10 days, there will be obvious rainfall processes in southern South China and eastern Jiangnan, which is conducive to the relocation of pests and the further expansion of diseases.
1. Rice planthopper
The rice planthoppers are generally light to moderate, with an area of ​​90.73 million mu, an increase of 1.4% year-on-year. In mid-September, the South China and Jiangnan rice areas monitored obvious resettlement peaks; according to the national 172 rice planthopper survey and reporting regional station monitoring statistics, the average single-light traps were 1,412, a year-on-year decrease of 12.8%; among them, brown planthoppers accounted for 63.5%. Compared with the same period of last year, it decreased by 1.3 percentage points. The amount of insects in the field has increased. The amount of late-season rice in the middle reaches of South China, Jiangnan and the Yangtze River is generally 200-600, the high 800-1,500 heads, and the local leakage prevention field exceeds 10,000 heads; the single-season rice area in the lower reaches of the Yangtze River is generally 10 ~100 heads, high 200-400 heads, Jiangsu Jianhu local high 1,172 heads. The number of eggs in the field is locally high. For example, the average number of eggs in Hunan is 529.2, which is 4.3 times that of the same period of last year.
2, rice leaf roller
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. In mid-September, the mid-stream and the southeast coast of the Yangtze River monitored the relocation peak, and the peak period was long. Among them, Haining, Zhejiang Province, lasted for 11 consecutive days from September 2 to 12, and the amount of moths per mu was over 1,000. The peak moth was high, according to the country. The monitoring data of 172 rice leaf roller is reported in the regional station, and the average single-light moth is 331, which is 3.1 times that of the same period of last year. The amount of moths in the rice areas of South China and Jiangnan is generally 50-500 heads, 600-1,000 heads high; the amount of moths in the eastern part of the Yangtze River and the middle and lower reaches of the Yangtze River is generally 200-800, and the area along the Yangtze River in Jiangsu is as high as 2,000-6,000 heads. Danyang and Jiangxi have built a new local plot of over 10,000 heads. The amount of eggs in the field was “southern increased from north to north†compared with the previous two weeks. The larvae in the south China rice area are generally 2,500 to 4,500, and the southwestern part of Guangxi and the western part of Guangdong are as high as 10,000 to 30,000 heads. The larvae in the middle and lower reaches of the Yangtze River and the middle and lower reaches of the Yangtze River are generally 500 to 2,500, and the height is 3,000 to 5,000. In some areas, the egg volume is high, and the total number of eggs in the northern part of Zhejiang, the northwestern part of Jiangsu, and southern Jiangsu is as high as 10,000 to 30,000. The local field in Zhangzhou, Zhejiang Province has a maximum of 116,000. The damage of leaf rolling in the field is generally less than 3%, and the high is 7% to 11%. The severe field in Wuning, Jiangxi is as high as 41%.
3, bismuth
The stem borer occurs in the middle 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%. In the southern part of the south of the Yangtze River, the mites have entered the four-generation larvae hatching stage, and the rice sorghum in the northern part of the Yangtze River and the middle and lower reaches of the Yangtze River have entered the three generations of adults. The amount of larvae in the field is generally 120-750, and the height is 1,000-3,000. The number of Yongning, Zhuzhou, Shaodong, Fuyang and Jiangxi Yongxi in Hunan is as high as 7,000-9,500. 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%.
4, sheath blight
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%. 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% to 20%, and the high is 20% to 50%. 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
Rice blast disease generally occurs lightly, 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. The leaf disease rate of rice in the middle and lower reaches of South China, Jiangnan and the Yangtze River is generally 0.1% to 2%, and the high is 6% to 20%. The disease-preventing varieties in Guangdong and Hubei are as high as 40% to 60%. The panicle neck stalks are successively manifested in the south and middle reaches of the Yangtze River. The diseased ear rate is generally 0.1% to 1.5%. The Jiangxi Yongxiu, Jiangsu Gaochun, and Hubei Hong'an local leakage prevention fields are as high as 10%, 18.4%, and 76.3%, respectively.
6, southern rice black streaked dwarf disease
Southern rice black-streaked dwarf disease occurs in the southern China and Jiangnan rice areas, with an area of ​​560,000 mu, a year-on-year decrease of 68.9%. Among them, the disease rate in South China is generally 1% to 5%, and the high is 10% to 20%. The local field in Guangxi coastal area and northwest is as high as 40% to 100%; the disease rate in Jiangnan rice area is generally 0.1% to 3.3%. The rate of disease in Jiangxi Dayo was 5.6%, and that of local fields was as high as 12%.
7. Future trends and recommendations
According to the National Meteorological Center, in the next 10 days, there will be obvious rainfall processes in southern South China and eastern Jiangnan. The cumulative rainfall is 3 to 70% higher than normal, 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.
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