From November 2010 to March 2011, there was stable snow cover in eastern Inner Mongolia and northern Xinjiang, which was conducive to the wintering of grassland locusts. Since April, the temperature and humidity conditions in Inner Mongolia and other four provinces (regions) have been conducive to the hatching and larval development of grassland aphids. It is expected that in the summer of 2011, the meteorological grades of grassland aphids in most parts of central and eastern Inner Mongolia, parts of northern Xinjiang and western part of China, southeastern part of Ningxia, and southeastern Gansu will be high; the occurrence of aphids in the south-central part of Inner Mongolia and parts of northeastern part of China, and grassland in central Xinjiang The meteorological level is relatively high; all localities should pay close attention to weather changes and do a good job in prevention and control.
It is estimated that from May 13 to 31, the temperature in most of the four provinces (regions) such as Inner Mongolia is close to normal, and the precipitation is less, which is beneficial to the development of locusts.
It is estimated that in the summer of 2011, the temperature in most of Inner Mongolia and other four provinces (regions) is close to normal or high, and precipitation is relatively low. The temperature in eastern Inner Mongolia, central and eastern Xinjiang, and western Gansu is about 1 °C higher, eastern Inner Mongolia and northern Xinjiang. Precipitation is less than 2 to 5 percent; it is conducive to the occurrence and development of grassland locusts.
The calculation results of meteorological grade prediction model for grassland locust occurrence show that: in the summer of 2011, most of the central and eastern Inner Mongolia, northern Xinjiang and parts of western China, southeastern part of Ningxia, and southeastern Gansu grassland have high meteorological grades, and meteorological conditions are suitable for grassland locusts. Occurrence and development; the meteorological grade of the grassland in the south-central part of Inner Mongolia and parts of the northeastern part of Xinjiang and the central part of Xinjiang is higher; the rest of the area has a lower meteorological level.
Prevention and control recommendations:
1. From mid-May to late June, grassland locusts in most of the northern four provinces entered the third infancy from west to east, which is a key period of prevention and control. Grassland locusts should be closely monitored in areas with high meteorological grades, and drug mites and biological mites should be carried out in a timely manner. Areas with conditions can take measures to eliminate mites according to weather conditions to prevent the spread of locusts. Areas with low meteorological grades and agro-pastoral areas should pay close attention to the occurrence and development of locusts in surrounding areas, and take appropriate non-proliferation measures in time to avoid the damage caused by locusts moving into grasslands and farmland.
2. From July to August, the grassland locusts in the northern grassland will enter the spawning period. All localities should pay attention to comprehensive treatment of areas suitable for aphid spawning, such as low vegetation coverage and soft soil, reducing the number of eggs laid by adults and the number of eggs. The number of eggs in the late wintering insects.
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