according to Shanxi Based on the meteorological conditions in June and the weather forecast results in July, combined with the relevant data of disease and pest investigation data of the provincial plant protection station, it is estimated that the cotton aphid will be located in the southern part of Shanxi province in July. Cotton producing area Moderate occurrence occurred in the three generation of cotton bollworm.

According to the climate center of Shanxi Meteorological Bureau, the total precipitation in July was between 75 and 170mm, and the precipitation in the northern part of the province and the northwest part of Lvliang was 1~2 less than that in the northwest part of the province. In the north part, it was less than 2. The precipitation in the central and southern parts was more than 1~2. In July, the average air temperature in most parts of the province was slightly higher than that in the whole year, and some areas were higher than 0.5 in the southern part of the country. air temperature Slightly lower.

During the main flood season in July, precipitation in southern Jinzhong increased and rainfall in the North was relatively low. With potato and cotton entering flowering stage, the common diseases and insect pests of various crops have gradually entered the multiple period. The low rainfall in the north in July may continue to cause drought in the north and central parts of the country. Precipitation in the southern part of July is not conducive to the occurrence and development of the three generation of Helicoverpa armigera.

Based on the above analysis and model calculation, it is estimated that cotton aphid will occur moderately in the main cotton producing area in the southern part of the province in July, and the three generation of cotton bollworm will be lighter.