Kang Yeolgyu, Koo Hyun-Na, Kim Hyun-Kyung, Kim Gil-Hah
Department of Plant Medicine, College of Agriculture, Life and Environment Science, Chungbuk National University, Cheongju 28644, Republic of Korea.
Insects. 2022 Dec 7;13(12):1130. doi: 10.3390/insects13121130.
The brown planthopper (BPH) and white-backed planthopper (WBPH) are serious rice insect pests that cannot overwinter in Korea and migrate from southeast Asian countries and China. In this study, we investigated the sublethal effects of imidacloprid and sulfoxaflor on the biological parameters and feeding behavior of planthoppers. These sublethal concentrations significantly decreased the net reproduction rate (), the intrinsic rate of increase (), and the mean generation time (). For BPHs, the total durations of nonpenetration (NP) waveform by imidacloprid (LC = 164.74 and LC = 176.48 min) and sulfoxaflor (LC = 235.57 and LC = 226.93 min) were significantly different from those in the control group (52.73 min). In addition, on WBPHs, the total durations of NP waveform by imidacloprid (LC = 203.69 and LC = 169.9 min) and sulfoxaflor (LC = 134.02 and LC = 252.14 min) were significantly different from those in the control group (45.18 min). Moreover, the LC and LC of these insecticides significantly decreased the phloem feeding time. In conclusion, imidacloprid had a better effect on the inhibition of feeding of the WBPH, and sulfoxaflor showed a better effect on the inhibition of feeding of the BPH. Therefore, it is suggested that treatment with sublethal concentrations of the above insecticides will reduce the feeding of BPHs and WBPHs on rice phloem.
褐飞虱(BPH)和白背飞虱(WBPH)是严重的水稻害虫,无法在韩国越冬,而是从东南亚国家和中国迁飞而来。在本研究中,我们调查了吡虫啉和氟啶虫胺腈对飞虱生物学参数和取食行为的亚致死效应。这些亚致死浓度显著降低了净繁殖率()、内禀增长率()和平均世代时间()。对于褐飞虱,吡虫啉(LC = 164.74和LC = 176.48分钟)和氟啶虫胺腈(LC = 235.57和LC = 226.93分钟)导致的非刺探(NP)波形总持续时间与对照组(52.73分钟)有显著差异。此外,对于白背飞虱,吡虫啉(LC = 203.69和LC = 169.9分钟)和氟啶虫胺腈(LC = 134.02和LC = 252.14分钟)导致的NP波形总持续时间与对照组(45.18分钟)有显著差异。而且,这些杀虫剂的LC和LC显著降低了韧皮部取食时间。总之,吡虫啉对抑制白背飞虱取食的效果更好,氟啶虫胺腈对抑制褐飞虱取食的效果更好。因此,建议用上述杀虫剂的亚致死浓度处理可减少褐飞虱和白背飞虱对水稻韧皮部的取食。