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 low temperature is conducive to the further expansion of the "two-shift" pests to land and land. So what are the pests and diseases in the growth of late rice? How to prevent late rice pests and diseases? Let's take a look. 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 relocation peaks; according to the monitoring data of 172 rice planthoppers in the country, 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%. 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 heads, 800-1500 heads high, 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, 1172 heads of Jiangsu Jianhu. 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. 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-to-lower reaches of the Yangtze River and the southeastern coast monitored the relocation peaks, and the peak period was long. Among them, Haining, Zhejiang Province, surpassed 1,000 heads per mu for 11 consecutive days on September 2-12; the peak moths were 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, 600-1000 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 heads, and the area along the Yangtze River in Jiangsu is as high as 2000-6000 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 2,500-4,500 heads, and the southwestern part of Guangxi and the western part of Guangdong are as high as 10,000-30,000 heads. The larval amount of larvae in the middle and lower reaches of the Yangtze River and the middle and lower reaches of the Yangtze River is generally 500-2500 heads, 3000-5000 heads high; in some areas, the egg volume is high, and the amount of eggs in the north of Zhejiang, the northwestern part of Jiangsu, and the southern part of Jiangsu is as high as 10,000-30,000. The local field in Zhangzhou, Zhejiang Province has a maximum of 116,000. The rate of leaf rolling in the field is generally less than 3%, and the high rate is 7%-11%. The severe field in Wuning, Jiangxi is as high as 41%. Chilo suppressalis 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%. 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 heads, the height of 1000-3000 heads, Hunan Changning, Zhuzhou, Shaodong, Fuyang and Jiangxi Yongxiu parts as high as 7000-9500 heads. The rate of heart failure caused by damage in the field is generally 0.1%-2%, and the high rate is 2.4%-6.7%. The dead rate of the local leakage prevention field in Chongyang, Hubei is as high as 50%. 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%-20%, and the high 20%-50%. Guangxi coastal and southeastern parts, southwestern part of Jiangxi Up to 60%-95%; the disease in the lower reaches of the Yangtze River is basically stable, the disease rate is generally 10% -35%, and the high is 40% -60%. rice blast 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. The leaf disease rate of rice in the middle and lower reaches of South China, Jiangnan and the Yangtze River is generally 0.1%-2%, and the high 6%-20%. The disease-preventing varieties in Guangdong and Hubei are as high as 40%-60%. The panicle neck stalks are successively manifested in the south and middle and lower reaches of the Yangtze River. The diseased ear rate is generally 0.1%-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. 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%-5%, the high is 10%-20%, and the local field in Guangxi coastal area and northwest is as high as 40%-100%; the disease rate in Jiangnan rice area is generally 0.1%-3.3%. The rate of disease in Jiangxi Dayo was 5.6%, and that of local fields was as high as 12%. More pesticide knowledge , please pay attention to China Pesticide Network
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Summary of late rice pest control techniques