The beet armyworm poses a risk of severe outbreaks in localized areas of Hebei and Shandong provinces.

Release Date:

2018-06-23

According to monitoring by the pest and disease forecasting network for summer maize in the Huang-Huai-Hai region, the first-generation adults of the two-spotted armyworm have emerged in relatively large numbers this year. Favorable field conditions and future climatic prospects suggest that the pest is expected to occur at a moderate level across the major summer maize‑growing areas of the Huang-Huai-Hai region. In localized areas of Hebei and Shandong where fields are heavily mulched, outbreaks may be more severe, whereas regions with effective ecological management practices and minimal field mulch are likely to experience lighter infestations. The nationwide affected area is estimated at 20 million mu, with the peak larval damage occurring from late June to early July. 1. Adult populations in most areas exceed those of previous years. By late May and early June, provinces including Anhui, Jiangsu, Henan, Shanxi, Shandong, and Hebei…

According to the Huang-Huai-Hai summer Corn According to monitoring by the district pest and disease forecasting network, the first-generation adults of the two-spotted armyworm have emerged in large numbers this year. Field conditions and future climatic factors are generally favorable, suggesting that the two-spotted armyworm is expected to occur extensively in the Huang-Huai-Hai summer cropping region this year. Corn In the main production areas, the pest is expected to occur at a moderate level overall. In Hebei and Shandong, fields with heavy mulch coverage in localized areas may experience more severe infestations, while regions with effective ecological management practices and minimal mulch are likely to see lighter outbreaks. The nationwide affected area is estimated at 20 million mu, with the peak larval damage occurring from late June to early July.
　　1 In most areas, adult insect populations are higher than in previous years.

　　In late May and early June, provinces including Anhui, Jiangsu, Henan, Shanxi, Shandong, and Hebei entered the peak emergence period for first-generation adults. From June 1 to 14, cumulative moth catches at monitoring sites in Gucheng, Ningjin, Zhengding, Cang County, and Linxi in Hebei ranged from 4,600 to 8,800 moths—levels that represent either the highest or second-highest totals recorded for this time of year since 2012. In Shandong, Henan, Anhui, and Jiangsu, cumulative catches at monitoring stations fell between 500 and 1,400 moths; among these, Zhangqiu in Shandong, Feng County in Jiangsu, Xiaoxian and Qiao in Anhui, as well as Minquan and Xun County in Henan, reported the highest levels in recent years. (Detailed data for each site are provided in Table 1.)

2. Field habitats are conducive to larval occurrence and damage.
　　This year’s Huanghuaihai summer Corn Main producing area Wheat Mechanical harvesting is widely practiced, with more than 90% of wheat chaff and straw returned to the field. The large quantities of chaff and straw left on the surface create a thick mulch, providing an ideal environment for adult beet armyworms to lay eggs and for larvae to develop. In Hebei, Shandong, Henan, and other regions, the timing of seedling emergence closely coincides with the larval period, facilitating larval damage. In some areas, ecological management practices such as clearing planting rows can help mitigate the problem. Corn Victim.
　　3. Meteorological conditions are generally favorable for the occurrence and damage caused by the two-spotted armyworm.
　　According to monitoring and forecasts from the National Meteorological Center, eastern Shandong and most of Henan are expected to experience above-normal precipitation from June 8 to 18. Over the next 20 days, cumulative rainfall in the Jianghuai region and the central and eastern parts of the Huanghuai Plain is forecast to range from 60 to 90 millimeters, while in North China and other areas it will be 15 to 30 millimeters. Compared with the long-term average for this period, rainfall in the Huanghuai and Jianghuai regions is likely to be 20% to 50% above normal, with some localized areas seeing increases of 100% or more. The pronounced precipitation across North China, the Huanghuai Plain, and the Jianghuai region has created field conditions favorable for the emergence and damage caused by the larvae of the two-spotted armyworm. After June 20, parts of eastern North China and the Huanghuai Plain are expected to experience 4 to 6 days of intermittent heat, which will exert a moderating influence on adult oviposition, egg hatching, and larval development and feeding.

Author: Pest and Disease Monitoring and Forecasting Division, National Agricultural Technology Extension Service Center Source: Pest and Disease Monitoring and Forecasting Division, National Agricultural Technology Extension Service Center

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