浙江农业科学 ›› 2025, Vol. 66 ›› Issue (5): 1232-1236.DOI: 10.16178/j.issn.0528-9017.20240043

• 植保技术 • 上一篇    下一篇

不同乙基多杀菌素施用时期对水稻二化螟的防治效果及抗性

曹米娜1(), 吴聪2,*()   

  1. 1.东阳市种植业技术推广中心,浙江 东阳 322100
    2.兰溪市农业技术推广中心,浙江 兰溪 321100
  • 收稿日期:2024-01-12 出版日期:2025-05-11 发布日期:2025-05-20
  • 通讯作者: 吴聪(1993—),男,硕士,研究方向为植物保护,E-mail:1031645568@qq.com
  • 作者简介:曹米娜,女,研究方向为植物保护,E-mail:1138704090@qq.com

Control efficacy and resistance of spinetoram applied at different periods against Chilo suppressalis in rice

CAO Mi'na1(), WU Cong2,*()   

  1. 1. Dongyang Agricultural Technology Extension Center, Dongyang 322100, Zhejiang
    2. Lanxi Agricultural Technology Extension Center, Lanxi 321100, Zhejiang
  • Received:2024-01-12 Online:2025-05-11 Published:2025-05-20

摘要: 为探究二化螟不同为害时期喷施杀虫剂的防治效果,同时了解不同乡镇街道二化螟幼虫对乙基多杀菌素的抗药性,进行了稻苗浸渍法和大田试验。结果表明,25%乙基多杀菌素WG在枯鞘率≤10%时喷施能表现出较好的保苗效果和杀虫效果,尤其枯鞘率为0%~5%时,在施药后20 d的杀虫效果和保苗效果分别为64.40%和68.62%。当枯鞘率>15%时喷施25%乙基多杀菌素水分散粒剂(WG)20 d的杀虫效果和保苗效果相对较差,分别为17.78%和21.74%。不同乡镇街道二化螟幼虫对乙基多杀菌素的抗性水平存在显著差异,其中香溪镇、水亭乡、永昌街道、上华街道和游埠镇的二化螟幼虫已对乙基多杀菌素产生中等抗性,尤其是游埠镇,90%致死浓度(LC90)为633.34 mg·L-1。总体而言,乙基多杀菌素对大多数乡镇街道的二化螟幼虫具有较高的生物活性,在田间水稻枯鞘率≤10%时即可喷施25%乙基多杀菌素WG,防治时可与其他杀虫剂混配或轮换使用。

关键词: 二化螟, 乙基多杀菌素, 不同时期, 抗药性, 防治效果

Abstract:

To investigate the control efficacy of insecticides sprayed at different infestation periods of Chilo suppressalis and to assess the resistance of Chilo suppressalis larvae to spinetoram in various towns and subdistricts, rice seedling dipping method and field trials were conducted. The results showed that 25% spinetoram water-dispersible granules (WG) demonstrated better seedling protection and insecticidal effects when applied at a deadheart rate ≤10%, especially when the deadheart rate was 0%-5%. At 20 days after application, the insecticidal and seedling protection effects reached 64.40% and 68.62%, respectively. However, when applied at a deadheart rate >15%, the insecticidal and seedling protection effects of 25% spinetoram WG at 20 days after application were relatively poor, at 17.78% and 21.74%, respectively. Significant differences in resistance levels to spinetoram were observed among Chilo suppressalis larvae from different towns and subdistricts. Larvae from Xiangxi Town, Shuiting Town, Yongchang Subdistrict, Shanghua Subdistrict, and Youbu Town had developed moderate resistance to spinetoram, with Youbu Town exhibiting the highest resistance (LC90 = 633.34 mg·L-1). Overall, spinetoram exhibited high biological activity against Chilo suppressalis larvae in most towns and subdistricts. Field application of 25% spinetoram WG is recommended when the deadheart rate is ≤10%, and it can be mixed or alternated with other insecticides for enhanced control.

Key words: Chilo suppressalis, spinetoram, different application periods, resistance, control efficacy

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