Hu Shao-Ji, Dong Li-Min, Wang Wen-Xin, Chen Sui-Yun, Ye Hui
Institute of International Rivers and Eco-security, Yunnan University, Kunming, China.
Yunnan Key Laboratory of International Rivers and Transboundary Eco-security, Yunnan University, Kunming, China.
J Insect Sci. 2019 Jan 1;19(1):11. doi: 10.1093/jisesa/iez002.
The white-backed planthopper, Sogatella furcifera (Horváth), is a devastating migratory rice pest in South China; lack of effective methods to identify immigrating populations is the main cause of difficulties in outbreak forecasting, active prevention, and control. The current study set up field cages (2 × 2 × 3 m each, US-80 standard nylon mesh) in both early- and mid-season paddies in Yuanjiang (Red River) Valley in Yunnan, China, in 2012 and 2014. The immigrating population was successfully separated from the local population of S. furcifera and identified using statistical comparisons. The findings showed that densities of macropterous adults outside the cages were all significantly higher than those inside the cages on both early- and mid-season rice in both years, whereas the densities of young nymphs and old nymphs showed no significant differences. This indicated that immigrations were occurring, the earliest of which occurred on early-season rice in early May and reached its peak in mid-late May before a rapid collapse in both years. In contrast, the immigration on mid-season rice showed a continuous decline or fluctuation throughout the entire period. Analyses demonstrated that the migration process of S. furcifera in the Yuanjiang Valley features continuous immigration from the adjacent southern parts of Yunnan, which may represent most migration events in Yunnan during the outbreak period of a year. The findings of this case study could benefit our understanding of planthopper migration and outbreaks in other parts of China, especially where the outbreak pattern is very different from Yunnan.
白背飞虱，即褐飞虱（Sogatella furcifera (Horváth)），是中国南方一种极具破坏性的迁飞性水稻害虫；缺乏有效的方法来识别迁入种群是爆发预测、主动预防和控制困难的主要原因。本研究于2012年和2014年在中国云南元江（红河）流域的早稻和中稻田中设置了田间网笼（每个2×2×3米，US-80标准尼龙网）。通过统计比较成功地将迁入种群与当地褐飞虱种群分离并进行了识别。结果表明，在这两年的早稻和中稻上，网笼外的长翅型成虫密度均显著高于网笼内，而若虫和老若虫的密度则无显著差异。这表明迁飞正在发生，最早在5月初的早稻上出现，在5月中下旬达到高峰，随后在两年内迅速下降。相比之下，中稻上的迁飞在整个期间呈现持续下降或波动。分析表明，元江流域褐飞虱的迁飞过程具有从云南相邻南部地区持续迁入的特征，这可能代表了云南一年爆发期内的大多数迁飞事件。本案例研究的结果有助于我们了解中国其他地区飞虱的迁飞和爆发情况，特别是爆发模式与云南非常不同的地区。
