Since July, the high temperature and little rain in this city has been conducive to the occurrence of corn pests. Combined with the comprehensive analysis of the current corn growth and future weather forecast, the city's middle and late stages of corn pest occurrence forecast are as follows:
It is expected that the overall occurrence of diseases and insect pests in maize will occur moderately and occur at a moderate degree. The degree of occurrence is lighter than that of the previous year.
Maize pests include armyworm, corn borer and peach aphid. Among them, the second-generation corn borer occurred lightly and locally moderately, with an area of ​​about 766,000 mu. The third generation of corn borer and peach aphid occurred in medium-sized areas with an area of ​​about 511,000 mu. The third-generation of armyworms occurred lightly and occurred at a moderate degree. An area of ​​324,000 mu; two A. moth insects in a number of adult areas in a higher number, there is the possibility of causing damage in the local plot; brown foot angle chest leaf A moderate incidence in some areas.
The occurrence of corn disease was mild and moderately moderate, with major (small) leaf spot, brown spot disease, curvularia leaf spot, and sheath blight.
The bandits are expected to occur slightly in Miyun, Yanqing, Huairou, Pinggu Reservoir and the surrounding areas. The occurrence is more severe than in the first two years, with an area of ​​about 12,000 mu. The second generation of grasshoppers occurred lighter than the previous year.
Forecast basis:
(I) The worm base is lower than the average
Second-generation armyworm: The density of larvae is low. The average number of insects in spring corn is 1.3, and the highest is 16. The average number of insects in summer corn is less than 1. The average number of corn pods is 1.3, and the highest is 1.3. The average number of damaged plants was 3.3% and the highest was 19%, which was lower than the average. The bandits: the average density was 5.5 heads per square meter and the highest was 11.2 heads; the two point insects were high in the number of adults in the counties and counties and accumulated in the city. The head of the moth is 1,314, and the density of larvae is generally less than 1 head per square meter, and the highest is 4. The rate of the brown-footed thoracic leaf A: summer sowing maize field is approximately 90%, and the general number of 100 insects is 30-100 heads. The number of infected plants in serious plots reached 100%, and the number of insects in one hundred strains exceeded 1,000; maize spot disease: the initial period was close to normal, and the average diseased rate of spring corn was 1%-10%, and the highest diseased plant rate was 42%.
(b) Host conditions and pest resistance
The city's corn planting area is 1,255,000 mu, of which, the spring corn planting area is 855,000 mu, an increase of 205,000 mu over the previous year. The main cultivars were Nongda 108, Zhengdan 958, Zhongdan 28, and Jiyuan No. 1, and Xianyu 335 and Zhongjin 368. According to the survey, Zhengdan 958 has small leaf spot, corn borer, anti-curved leaf spot disease, dwarf mosaic disease, and head smut; Xianyu 335 has a high sensitivity and large spot disease. The area sown to summer corn is 400,000 mu, which is 550,000 mu less than that of the previous year. The area reduction is conducive to the concentration of three generations of the armyworm. The main cultivars were Chengdan 958, Jingdan 28, and Jiyuan No. 1. Jingdan 28 is resistant to large and small leaf spot, Curvularia leaf spot, and gray spot disease.
(c) Meteorological conditions are more favorable for corn pests
According to the forecast of the meteorological department of this Municipality, the average temperature in the plain area of ​​the city is close to the same period of the year from July to August, and the precipitation is slightly less than the same period of the normal year. The weather at this stage is conducive to the occurrence and damage of pests.
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