According to the Meteorological Grade of Agriculture, Forestry and Pests of the Central Meteorological Observatory, since August, the average daily temperature in the middle and lower reaches of the Yangtze River and most of the southwestern region and the southwestern Shaanxi has been maintained at 20-28 °C; the number of rainy days is 5-7 days, including southwestern Hubei and Yunnan. The number of rainy days in parts such as the southwest is more than 7 days. The weather conditions of moderate temperature, high humidity and illuminating are conducive to the occurrence and development of rice blast. It is expected that the occurrence and development of rice blast in some areas of central Hubei, northeastern Sichuan and southern Yunnan will be higher in the middle and late August.
It is expected that in the next 10 days, there will be more precipitation in the southwestern Shaanxi, Jianghan and Southwest regions, which is conducive to the development of rice blast. According to the comprehensive development of the rice development process and the occurrence and development of rice blast disease and the prediction results of the model, in the middle and late August, the southeastern part of Shaanxi, the central part of Hubei, the northeastern part of Sichuan, the northwestern part of Chongqing, the southern part of Guizhou and The occurrence and development of rice blast in the southern rice areas of Yunnan Province is relatively high. Among them, rice blasts in some southeastern parts of Shaanxi, northeastern Sichuan and southwestern Yunnan have high meteorological grades, and meteorological conditions are favorable for the occurrence and development of rice blast; The occurrence and development of rice blast in the remaining large rice areas in the middle and lower reaches of the Yangtze River is low, and meteorological conditions are not conducive to the occurrence and development of rice blast.
Prevention and control advice
The mid-to-late August is the high-risk period of the ear-spotted period of the southern rice in the first season, and it is also the best time for prevention and control. Suggest:
1. The occurrence and development of rice blast disease should be carried out in areas with high meteorological grades, and the pesticides should be sprayed to prevent the occurrence and development of rice blast. At the same time, rice blast disease monitoring should be strengthened and the diseased rice plants should be treated in time, at the end of the rice and at the heading stage. Spray pesticides to prevent and control the disease, and prevent the spread of the disease.
2. Strengthen the management of water and fertilizer in rice fields, avoid excessive fertilization and deep irrigation, and enhance the disease resistance of rice plants; it can be used to prevent disease and increase fertilizer, improve farmland ecological environment, and prevent the occurrence and development of rice blast.
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