At present, the mid-season in South China and Jiangnan and the single-season rice in the southwest and northeast are in the period of grain filling to milky maturity. The late rice in South China and Jiangnan is in the tillering to booting stage, and the single-season rice in the middle and lower reaches of the Yangtze River is in the heading stage. Rice pests and diseases generally occur in mild to moderate occurrence, in which stem borer and sheath blight occur moderately, rice planthoppers and rice leaf roller are mild to moderate, and rice blast occurs lightly.
In the next stage, there are more rainfalls in the south of the Yangtze River, South China and Southwest China, which is conducive to the relocation of the two-shifted pests and the occurrence of pests and diseases in rice. The adults of the rice cultivars in the middle and lower reaches of the Yangtze River lay large numbers of eggs, and the amount of larvae in the field will be rapid. increase.
Rice planthopper
Rice planthoppers occur in light to moderate areas in the southern rice region, with an area of ​​86.23 million mu, a decrease of 5.7% year-on-year. Recently, there is no obvious trapping peak in the southern rice area. According to the monitoring statistics of 275 rice planthoppers in the country, the total number of insects under the lamp decreased by 62.2% year-on-year. According to local monitoring, the amount of larvae in the South China, Jiangnan, and Southwest single-season rice areas is generally 450-900, and the high is 1000-2500. In the South China and Jiangnan, the rice planthoppers in the late rice paddy are generally 100-500 heads, the high ones are 700-1600 heads, and the western Sichuan, southeastern Guangxi and southern Anhui fields are as high as 2000-4000 heads. The rice planthoppers in the single-season rice region in the middle and lower reaches of the Yangtze River are generally less than 300 heads, and the high ones are 400-600 heads. Compared with the same period of last year, the amount of insects in the field was generally low and partially high. Hainan, Guangxi, Sichuan and Jiangxi were 14%-31% higher than the same period of last year.
Rice leaf roller
The rice leaf roller is generally light to moderate in the southern rice area, with an area of ​​74.39 million mu, a year-on-year decrease of 14.3%. In late August, the peaks of the six (4) moths of the rice leaf roller were detected in the middle and lower reaches of the Yangtze River. The amount of moths in Jiangsu along the Taihu Lake and along the Yangtze River was 1000-4500; the amount of moths in the South China and Jiangnan rice areas was generally 50-400 heads, high 500-1100 heads. The amount of larvae in the field has increased from the previous period. The larvae in the South China and Jiangnan rice areas are generally 1000-7000 heads, and the high ones are 10,000-30,000 heads. The larvae in the middle and lower reaches of the Yangtze River are generally 100-600 heads. The egg volume is generally 2000-10000, and Jiangsu has exceeded the large occurrence index along the Taihu Lake and along the Yangtze River. The degree of damage in the field is generally light, the leaf rolling rate is generally less than 4%, and the local field in Lishui, Hubei is as high as 49%.
Chilo suppressalis
The stem borer occurs in the middle of the Yangtze River, the southwest, the middle and lower reaches of the Yangtze River and the Jianghuai rice area. The current area is 63.2 million mu, an increase of 9.7%. Among them, the Jiangnan rice area is relatively prominent, the amount of larval larva is generally 100-600 heads, the height is 1000-5000 heads, and the local field of Xiangyang in Hunan is as high as 12,000 heads. The rate of dry sheath caused by damage in the field is generally 4%-16%, and that of Jiangxi Xingan is as high as 64%; the rate of heart failure is generally 0.1%-0.8%, and that of Hubei is as high as 16%.
Sheath blight
Sheath blight occurs in the main rice producing areas, with an area of ​​108 million mu, which is close to the same period of last year. The disease in the single-season rice areas of South China, Jiangnan Late Rice and the middle and lower reaches of the Yangtze River is expanding rapidly. The diseased plant rate is generally 1%-8%, the high is 10%-20%, the Jiangxi Ji'an is as high as 98%, and the disease rate is generally 10%- 35%, high is 40%-50%, Hubei Huangqi is up to 100%.
rice blast
Rice blast is generally mild, with an area of ​​15.16 million mu, a year-on-year decrease of 10.0%. The leaf blast disease rate of South China, Jiangnan mid-season and southwestern and northeast single-season rice areas is generally 0.1%-6%, high is 8%-20%; diseased ear rate is generally 0.3%-1.3%, and high is 2%-5 %. The leaf rate of rice blast in single-season rice fields in South China, Jiangnan late rice and middle and lower reaches of the Yangtze River is generally less than 3%, and Hubei Hong'an local field is as high as 52.5%.
Future trends and recommendations
According to the National Meteorological Center, in the next 10 days, affected by the low-pressure circulation and the monsoon cloud system, the rainfall in the eastern part of the south of the Yangtze River, South China and Southwest China is more than 3-6 percent more than normal, which is conducive to the return of the two-shifted pests and the moderate temperature. High-humidity weather conditions are conducive to the prevalence of rice pests and diseases in the region. In addition, the amount of rice larvae in the middle and lower reaches of the Yangtze River is large. With the large number of eggs laid by adults and the hatching of eggs, the amount of larvae in the field will increase rapidly. All localities need to strengthen monitoring, comprehensively grasp the dynamics of pests and diseases, timely release accurate information on pests and diseases, and effectively prevent and control the work.
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(Source: Agricultural Resources Guide)
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