四川省稻田越冬代二化螟寄生性天敌的研究

二化螟Chilo suppressalis是水稻生产上重要的常发性害虫, 以大龄滞育幼虫在稻桩中越冬, 研究其寄生性天敌, 对于害虫发生动态预警和防治具有重要意义。通过剥查四川地区稻桩内越冬代二化螟幼虫并室内饲养羽化收集天敌, 鉴定天敌种类和调查自然寄生率发现:2017年-2018年, 2018年-2019年及2019年-2020年, 寄生蜂自然寄生率分别为1.1%~8.6%, 1.5%~11.7% 和 1.9%~9.0%, 年度间自然寄生率无明显差异; 寄生蜂自然种群主要有螟甲腹茧蜂 Chelonus munakatae (Munakata)、大螟钝唇姬蜂 Eriborus terebrans (Gravenhorst)、中华茧蜂 Amyosoma chinensis (Szepligeti)、绒茧克氏金小蜂Trichomalopsis apanteloctena (Crawford)、螟蛉瘤姬蜂 Itoplectis naranyae (Ashmead)、螟黄足盘绒茧蜂 Cotesia flavipes (Cameron)、环腹瘿蜂 Figites sp.、稻螟小腹茧蜂 Microgaster russata (Haliday)、黏虫白星姬蜂 Vulgichneumon leucaniae (Uchida)和二化螟黑卵蜂Telenomus chilocolus(Wu et Chen)。四川省越冬代二化螟寄生性天敌的优势种为螟黄足盘绒茧蜂和螟蛉瘤姬蜂, 部分地区每年自然寄生率维持在较高的水平。

Species and parasitism of parasitic wasps of the overwintering rice stem borer, Chilo suppressalis (Walker) (Lepidoptera: Pyralidae) in Sichuan province

Chilo suppressalis (Walker) is an important pest in rice production and has extensive distribution and good adaptability. Parasitoid wasps are important natural enemies in rice fields and play an important role in regulating the population dynamics of rice pests. To clear the species and occurrence dynamics of the parasitic wasp of the local rice stem borer is great significance to effectively controlling the occurrence and damage of the rice stem borer. The parasitic wasps of the overwintering larval of rice stem borer in Sichuan were collected and identified by rice pile stripping method. The natural population of parasitic wasp of the overwintering larval of rice stem borer were abundant in Sichuan province. In 2017-2018, 2018-2019 and 2019-2020, the natural parasitic rate of overwintering rice stem borers was relatively low, which was 1.1%-8.6%, 1.5%-11.7% and 1.9%-9.0%, respectively. There was no obvious difference in the natural parasitism rate among the three intervals. The natural population of parasitic wasp mainly included Chelonus munakatae (Munakata), Eriborus terebrans (Gravenhorst), Amyosoma chinensis (Szepligeti), Trichomalopsis apanteloctena (Crawford), Itoplectis naranyae (Ashmead), Cotesia flavipes (Cameron), Figites sp., Microgaster russata (Haliday), Vulgichneumon leucaniae (Uchida) and Telenomus chilocolus (Wu et Chen). The dominant parasitic wasp species were I.naranyae and C.flavipes in Sichuan province, and the natural parasitic rate in some areas maintained at a high level every year.