Could fall armyworm, Spodoptera frugiperda (J. E. Smith) invasion in Africa contribute to the displacement of cereal stemborers in maize and sorghum cropping systems
Could fall armyworm, Spodoptera frugiperda (J. E. Smith) invasion in Africa contribute to the displacement of cereal stemborers in maize and sorghum cropping systems
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DOI：
10.1007/s42690-020-00381-8
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发表时间：
2021-01-27
影响因子：
1.2
通讯作者：
Subramanian, Sevgan
中科院分区：
文献类型：
--
作者：
Hailu, Girma;Niassy, Saliou;Subramanian, Sevgan
秋粘虫（FAW）、草地贪夜蛾（Spodoptera frugiperda（J.E.史密斯），最近入侵非洲大陆，已成为谷物生产的新威胁。作为一种具有一定竞争优势的入侵害虫，FAW对其他鳞翅目害虫的影响尚不清楚。本研究评估了在乌干达五个地区相邻种植的单一作物系统下，FAW和谷物蛀茎虫对玉米和高粱的侵染情况。在种植后6、9和16周（WAP）收集玉米和高粱侵染谷物茎虫和FAW的数据，以确定强度和严重程度。玉米在第6、9和16次取食后的螟虫侵染率分别为36.7%、48.2%和24.0%，显著低于高粱的55.5%、53.2%和64.0%。而在玉米上，FAW在6、9和16日龄的侵染率分别为89.5%、84.7%和86.0%，而在高粱上的侵染率分别为51.0%、56.5%和47.0%。高粱上蛀干害虫的危害程度显著高于玉米，而玉米上FAW的危害程度普遍高于高粱。二化螟对高粱的危害强度和蛀空长度均大于玉米。历史记载表明，在玉米中，螟虫的侵染率可达60%。这种侵扰在2016年开始显著下降，表明一汽提前抵达乌干达。目前的研究表明，茎螟可能从玉米转移到高粱。任何害虫综合防治（IPM）方案都应考虑在玉米和其他谷类宿主中同时管理FAW和蛀茎虫。
The fall armyworm (FAW), Spodoptera frugiperda (J.E. Smith), which has recently invaded the African continent, has become a new threat to cereal production. Being an invasive pest with certain competitive advantages, the impact of FAW on other lepidopteran pests is unclear. This study assessed the infestation of FAW and cereal stemborers on maize and sorghum under mono-cropped systems that are adjacently placed in five districts in Uganda. Data on maize and sorghum infestation cereal stemborers and FAW was collected at 6, 9 and 16 weeks after planting (WAP), to determine intensity and severity. Cereal stemborer infestations on maize at 6, 9 and 16 WAP were only 36.7%, 48.2% and 24.0%, respectively, which was significantly lower than the infestations on sorghum, at 55.5%, 53.2%, 64.0%, respectively. On the contrary, the infestations of FAW on maize at 6, 9 and 16 WAP were 89.5%, 84.7% and 86.0%, respectively, while on sorghum they were 51.0%, 56.5% and 47.0, respectively. The severity of stemborers on sorghum was statistically higher than on maize, whereas the damage severity of FAW was generally higher on maize than on sorghum. Intensity of damage and cavity length due to stemborer on sorghum was higher than on maize. Historical records showed that in maize stemborer infestation could reach 60%. This infestation started significantly declining in 2016, suggesting an early arrival of FAW in Uganda. The present study indicates a possible displacement of stemborer from maize onto sorghum. Any Integrated Pest Management (IPM) package should consider managing FAW and stemborer together in both maize and other cereal hosts.