Rice planthopper is a long-distance migratory pest that is mainly caused by rice, and its occurrence, reproduction, migration and meteorological conditions are closely related. The insect source of the rice planthopper often attacks from the south to the north in the summer with the downdraft or precipitation. In the landing zone, if the temperature is between 20 and 30 °C, the weather conditions of rain and high humidity will be very beneficial to the reproduction and growth of rice planthopper.
Since July, the cumulative precipitation in the central and eastern parts of the Yangtze River has been 100 to 200 mm, and the number of rainy days has reached 15 to 25 days, especially in mid-July, where the precipitation is 60 to 200 mm, and the number of rainy days is 7 to 10 days. The average daily temperature is 25 to 30. The suitable temperature between °C and the relative humidity of the air is conducive to the migration and landing of the rice locust source.
Except for mid-July, the temperature in most parts of the Yangtze River is high. The average daily temperature in central and eastern Hunan, most of Jiangxi, and the central and western Zhejiang is more than 30 °C for 15 to 25 days, and the precipitation is less, and the precipitation in southern Hunan is less. More than 80%, high temperature and low rainfall are not conducive to the development of rice planthoppers.
It is estimated that the precipitation in the northern part of the Yangtze River in mid-August will generally be 30-100 mm, and the precipitation in most parts of the south of the Yangtze River will be 25-100 mm. According to the prediction results of the meteorological conditions and models of rice planthopper migration and development, it is expected that the mid-eastern part of the Yangtze River and the western part of Hunan Province will have higher meteorological grades in the middle and late August, and the northwestern part of the Yangtze River and the eastern coastal areas of Zhejiang have a high level of migration. In the central part of Hunan Province, the rice planthoppers in the south-central part of Jiangxi have a lower meteorological grade.
It is expected that the meteorological grades of the rice planthoppers in the south of the Yangtze River in the middle and late August will be higher. The meteorological grades of the rice planthoppers in the northwestern part of Jiangxi are high. The meteorological grades of rice planthoppers in southeastern Hunan and southwestern Jiangxi are lower.
According to the current meteorological conditions and future weather conditions suitable for the development of rice planthoppers, China Xingnong.com proposes the following prevention and control recommendations: Co.,
1. In the middle and east of the Yangtze River, the rice locusts should be intensively monitored and moved to a higher level. According to the actual pest situation, timely control of pharmacy or light trapping should be carried out in sunny weather. At the same time, all localities should organize unified defense and rule, improve the control effect, and prevent the spread of rice planthoppers.
2. The rice area should pay attention to improving the rice field environment, clearing weeds in time, maintaining a reasonable group structure, promoting ventilation and light transmission of rice fields, timely controlling water and drying the fields, reducing the humidity in the field, and creating a farmland ecological environment that inhibits the occurrence and development of rice planthoppers. To minimize and mitigate the hazards of rice planthoppers.
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