Most of the rainy weather in March and Jianghan area in March was more stable in April, and some areas continued to be rainy. Strip rust occurred and spread, which provided conditions for the occurrence of stripe rust in Huanghuai wheat area. Since the beginning of spring, the temperature in Huanghuai wheat area has rebounded rapidly, and the temperature and humidity conditions in some areas are conducive to the spread of wheat stripe rust. Combined with the comprehensive analysis of the results of meteorological grade prediction model for the development of wheat stripe rust, it is expected that the meteorological grade of wheat stripe rust in most of Huanghuai in late April to May 2011 will be grade 2, and meteorological conditions are basically suitable for the occurrence and spread of wheat stripe rust; Henan Nanyang, Xinyang West and other places are Grade 1, and meteorological conditions are suitable for the development of wheat stripe rust. All localities should strengthen monitoring and prevention.
1. Most of the rainy weather in the southwest and Jianghan areas in March, the temperature in April rose steadily, which was conducive to the spread of stripe rust, which provided conditions for the occurrence of stripe rust in Huanghuai wheat area .
Since March 2011, most of the rainy weather in the southwest and Jianghan areas has provided better humidity conditions for the occurrence of wheat stripe rust; in April, the temperature has risen steadily, and the southwestern part of the country and the Jianghan have been rainy, sometimes accompanied by windy weather. The speed of strip rust expansion is significantly accelerated. The northwestern region has a small area and is mildly ill, but since the spring has risen and rainfall, some parts of the southeast have also spread. According to the monitoring of relevant departments of the Ministry of Agriculture, as of early April, wheat stripe rust has occurred in seven provinces and cities of Sichuan, Yunnan, Hubei, Guizhou, Gansu, Chongqing and Shaanxi. The spread of stripe rust in the above-mentioned areas has provided favorable conditions for the occurrence and development of stripe rust in the adjacent Huanghuai wheat area.
Second, since the spring, most of the temperature in the Huanghuai wheat area has rebounded rapidly, and the temperature and humidity conditions in some areas are conducive to the spread of wheat stripe rust .
Since the spring of 2011, most of the temperature in Huanghuai wheat area has rebounded rapidly, and the temperature is high. Some areas are 1~2°C higher. From late March to early April, there are more rainy and cloudy weather in southwestern Henan, and accumulated precipitation in some areas. The amount is above 30 mm. Influenced by the favorable topography of the Nanyang Basin, the temperature and humidity conditions are conducive to the occurrence and development of stripe rust. At present, wheat stripe rust has been found in some counties in Nanyang. According to the forecast of the Central Meteorological Observatory, from April 29 to May 1, there was a small to moderate rainy weather in the Huanghuai area, which was conducive to the spread of wheat stripe rust.
three. Meteorological grade model prediction result
According to the calculation results of the meteorological grade prediction model for the occurrence and development of wheat stripe rust, it is expected that the meteorological grade of most wheat stripe rust in the Huanghuai wheat area will be grade 2 from late April to May 2011, and the meteorological conditions are basically suitable for the development of wheat stripe rust; Henan Nanyang, Xinyang West and other places are Grade 1, meteorological conditions suitable for the development of wheat stripe rust, need to strengthen monitoring and prevention; Hebi, Anyang in northern Henan, Dezhou, Jinan and Taian in northern Shandong are grade 3, meteorological conditions are not suitable for wheat Strip rust has developed.
Grade 1: Weather conditions are suitable for the development of wheat stripe rust; Grade 2: meteorological conditions are basically suitable for the development of wheat stripe rust; Grade 3: meteorological conditions are not suitable for the development of wheat stripe rust .
Fourth, prevention and treatment recommendations
In May, the temperature in Huanghuai was higher than normal and the precipitation was less. Suggest:
1. Organize technical strength to penetrate the field, expand the scope of wheat disease monitoring, increase the frequency of monitoring, and do a good job of prevention and control to minimize or mitigate the impact of disease.
2. Strengthen field management, rational fertilization, promote wheat growth and development, and enhance wheat disease resistance.
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