Ecological intensification through organic farming is known to have an influence on plant communities and diversity of insects associated with them. The comparative abundance of natural enemies was studied in organically as well as conventionally (chemical control) grown aromatic rice at farmer’s field during 2015–2016 and 2016–2017. Different life stages, i.e., egg, larvae and pupae of rice stem borer, and leaf folder, were collected and brought to the laboratory to record natural parasitism in both organic and conventional fields. The population of predators was recorded through sweep nets. The population of spiders was recorded using pitfall traps and sweep net. A total of nine parasitoid species including 3 egg parasitoids ( T. chilonis , T. japonicum , and Telenomus sp.), 3 larval parasitoids ( Stenobracon nicevillei , Bracon sp., and Cotesia sp.), and 3 pupal parasitoids ( Tetrastichus sp., Brachymeria sp., and Xanthopimpla sp.) were recorded. However, the natural parasitism by these parasitoids was significantly higher in organic than conventional rice. Similarly, the population of predators like spiders, dragonflies, and damselflies was significantly higher in organic fields than in conventional fields. The study highlights the significance of conservation of these natural enemies for a sustainable system of rice insect pest management.

中文翻译：

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两种水稻农作系统中寄生蜂和捕食者的物种组成——生态集约化的效应

众所周知，通过有机农业进行的生态集约化会对植物群落和与之相关的昆虫多样性产生影响。2015-2016 年和 2016-2017 年期间，在农田有机和常规（化学控制）种植的香米中研究了天敌的相对丰度。收集水稻螟虫的卵、幼虫和蛹、叶片夹等不同生命阶段并带到实验室，记录有机田和常规田的自然寄生情况。掠食者的数量是通过扫网记录的。使用陷阱陷阱和扫网记录蜘蛛的数量。共9种寄生蜂，其中卵寄生蜂3种（T. chilonis、T. japonicum、Tenomus sp.），幼虫寄生蜂3种（Stenobracon nicevillei、Bracon sp.、和 Cotesia sp.），并记录了 3 种蛹寄生物（Tetrastichus sp.、Brachymeria sp. 和 Xanthopimpla sp.）。然而，这些寄生蜂的自然寄生在有机稻米中明显高于传统稻米。同样，蜘蛛、蜻蜓和豆娘等捕食者的数量在有机田中明显高于常规田。该研究强调了保护这些天敌对于可持续的水稻害虫管理系统的重要性。豆娘在有机田中的数量明显高于常规田。该研究强调了保护这些天敌对于可持续的水稻害虫管理系统的重要性。豆娘在有机田中的数量明显高于常规田。该研究强调了保护这些天敌对于可持续的水稻害虫管理系统的重要性。