Rice blast is one of the main epidemic diseases in the first season of rice in Southwest China. It can occur from seedling to panicle, but it has the greatest impact on rice yield at heading stage. Since July this year, the number of rainy days in the Sichuan Basin, most of Guizhou, and southwestern Yunnan has been high, and the lack of illumination is conducive to the occurrence and development of rice blast. According to the comprehensive analysis of meteorological conditions and model prediction results of rice blast, it is estimated that from the end of July to the beginning of August 2010, the occurrence of rice blast in the Sichuan Basin, most of Guizhou and parts of southwestern Yunnan is grade 1~2. The meteorological conditions are suitable for moderate to severe occurrence of rice blast. Compared with the same period in 2009, the meteorological conditions in the eastern part of the Southwest are more suitable for the occurrence and development of rice blast.
Since July, the Sichuan Basin and Guizhou have been rainy and rainy, and meteorological conditions are conducive to the occurrence and development of rice blast
At present, the first season rice in Southwest China is in the booting stage, and will enter the heading stage in the latter part of the season. Since July, most of the average daily temperature in the southwestern region has remained between 20 and 27 °C. The percentage of sunshine in the first half of July is below 40%, with the percentage of sunshine in the Sichuan Basin and western Yunnan being below 30% (Figure 1); Sichuan Basin The number of rainy days in western Guizhou and southwestern Yunnan is 7 to 10 days (Figure 2). The environment of moderate temperature, high humidity and illuminance is conducive to the development of rice blast.
It is expected that the meteorological conditions in the Sichuan Basin and Guizhou and other places in the Sichuan Basin and Guizhou will be moderate to heavy in the period from late July to early August 2010
It is expected that in the next 10 days, most of the southwestern regions will be dominated by rainy weather, which is conducive to the development of rice blast. According to the comprehensive analysis of meteorological conditions and model prediction results of rice blast, from late July to early August 2010 (one season rice heading and flowering period), rice blast development and development in Sichuan Basin, most of Guizhou and parts of southwest Yunnan The grade is 1 to 2, and the meteorological conditions are suitable for moderate to severe occurrence of rice blast; the western and southern Sichuan, western Guizhou, and central and northern Yunnan are grade 3, and meteorological conditions are not suitable for the development of rice blast (Fig. 3). Compared with the same period in 2009, the meteorological conditions in the eastern part of the Southwest are more suitable for the occurrence and development of rice blast.
Rice blast prevention and control recommendations
In late July, it is the high-risk period of rice ear and neck in the southwestern region, and it is also the best time for prevention and control. As the meteorological conditions in the eastern part of the southwestern region are suitable for the occurrence and development of rice blast in this year, it is recommended that:
(1) Strengthen the monitoring of rice blast, timely control and rule, and prevent the spread of disease.
(2) Grasp the precipitation gap and spray pesticides at the end of the booting stage or the beginning of the heading and the heading stage.
(3) Strengthen the management of water and fertilizer in rice fields to avoid excessive fertilization and deep irrigation. 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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