Recently, the Ministry of Agriculture issued three-generation forecast of the occurrence trend of the armyworm.
According to the forecast, the second generation of insects will have a wide area, large area, high density spots, and a high amount of debris. In the recent Northeast, North China and Huanghuai areas, there will be a second-generation adult moth peak; this year, the northern corn and rice will be sticky. The planting area of ​​insect host crops is large, and from July to the end of August, the rainfall in North China, Northeast China, Huanghuai, and Southwest China is more than normal, which is beneficial to the occurrence of third-generation armyworm. It is estimated that there will be an area of ​​about 60 million mu in the third generation of the armyworm. Among them, most of the northeast and north China will focus on the greatest occurrences. The occurrence of yellow huai, southwest and northwest regions will be moderate; the third generation of larvae in most areas will end in late July to late August. Mid-term.
The second generation of armyworm insects has a high amount of insects, and the number of insect sources is higher than that of the previous year and the year. The second-generation armyworms commonly occurred in the northeast, north China, Huanghuai, southwest and northwest regions. The area of ​​worms was 63.16 million mu, which was slightly lower than the 64.95 million mu in 2012, which was 80% higher than the 2001-2011 average. Since mid-July, various regions have gradually entered the second generation of adult emergence. The peaks of moth trapping occur in many areas in North China, Northeast China, and Huanghuai. Three generations of eggs and young larvae have been spotted in most parts of northeastern China and in many provinces in North China.
In this year's Northeast, North China, Huanghuai and other major producing areas, the corn planting area is large and growth is good. At present, the northern spring corn is mostly in the tasseling period, and the host's nutritional conditions and field ecological conditions are suitable for the occurrence of three generations of the armyworm. According to the forecast of the National Meteorological Center, in the next ten days, many rainfalls in north central and southern part of China, northeastern Inner Mongolia, northeastern China, Huanghuai, northern and western parts of the Sichuan Basin, and Yunnan will be beneficial to the landing, spawning and damage of armyworm.
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