Agricultural Resources News (Reporter Wang Zhaoyong) Recently, the reporter learned from the National Agricultural Technology Center's Pest and Disease Forecasting Office that according to the forecast of 22 major corn producing provinces ( autonomous regions and municipalities) and the experts of the corn industry system, they predicted the corn in the early stage. On the basis of the occurrence of pests and diseases, based on the current occurrence of corn pests and diseases, corn cultivation methods and crop layout, combined with future climate trend prediction and other factors, it is expected that the overall weight of pests will occur in the middle and late stages of this year, and the occurrence is more serious than normal. More important than the previous year, the disease was lighter than the previous year; from late July to the end of August, it was the end of various pests and diseases.
   Because the pre-corner pests are mainly corn borer, second-generation armyworm, larvae, underground pests, thrips, rough disease and sheath blight, the overall occurrence is moderate, and the degree is slightly heavier than the previous year. The area is 330 million mu, the corn pests occur 300 million mu, and the corn disease occurs 30 million mu. It is expected that the overall pests and diseases in the middle and late stages of corn will be biased.
   In the middle and late stages of maize, the diseases and insect pests are mainly drill collar, leaf-feeding, sucking pests and leaf diseases, among which the three-generation armyworm has a high risk of recurrence; corn borer, big spot disease and small spot disease are more common and harmful. Heavy; cotton bollworm, leafhopper, aphid, double spotted leaf beetle and brown spot, Curvularia leaf spot, head smut, smut, brown spot, stem rot, gray spot, etc. The area causes certain harm. The country is expected in late corn pests and diseases 9.2 million mu, 6.2 million mu of pests, diseases 3.0 million mu.
   Among them, the hazards of drill collar pests are more common. The first generation of corn borer occurred in Heilongjiang and occurred in the central and western regions. The second generation of corn borer occurred in Liaoning, Hubei, Hunan and Chongqing, Jilin, Inner Mongolia, Shandong, Shanxi and Shaanxi, Xinjiang, North China, Huanghuai and other parts of Southwest China. Moderate occurrence; three generations of corn borer occurred in Huanghuaihai; cotton bollworm occurred in Hebei, Henan, Shandong and Anhui, showing an upward trend. The leaf-feeding pests are geographically harmful. Three generations of armyworms occurred in the northeast and north China, and occurred in the Huanghuai, Southwest, and Northwest regions. Double spotted firefly leaves occur in Inner Mongolia, Hebei, Shanxi, and Shaanxi. The sucking pests such as aphids and spider mites occur in Ningxia, and occur in most of the northeast, north China, Huanghuai, southwest and northwestern regions.
   In terms of diseases, large spot disease occurs in the northeast and northern part of northern China; small spot disease occurs in Huanghuai and most of the southwest, and other areas occur lightly; brown spot disease has an obvious upward trend in recent years, and it can be heavier in Huanghuai area. Occurred; gray spot disease occurred in most parts of the southwest, and occurred in the northeast. In addition, diseases such as head smut, Curvularia leaf spot, sheath blight, tumor smut, stem rot, etc. will also cause certain harm in some areas.
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