Effects of Aphidius gifuensis Release on Population Dynamics of Wheat Aphids and its Natural Enemies in Wheat Fields

doi:10.16409/j.cnki.2095-039x.2025.07.001

Abstract

Abstract: Aphidius gifuensis, a parasitoid natural enemy of aphids, is widely used in China for the biological control of aphid pests on economic crops such as tobacco and vegetables. This wasp is also a dominant parasitoid for wheat aphids, particularly the grain aphid Sitobion avenae, and shows great promise in the biological control of the pests. In this study conducted in 2022 in Xinxiang, Henan Province, A. gifuensis was released twice at the initial stage of aphid occurrence in wheat Triticum aestivum fields, and the population dynamics of wheat aphids and their natural enemies as well as wheat yield were investigated. The results indicated that, compared to the control field, the onset of aphid control was about 7-10 days earlier in the fields with parasitoid release. The parasitism rate of wheat aphids by A. gifuensis reached 70.11% and 72.83% at 13 and 16 days after the second release, respectively, with wheat aphids reduced at 76.55% and 91.35%, respectively. Compared with the control, all the results above were statistically significant. Meanwhile, field releases of the parasitoid significantly reduced the aphid population during its second peak occurrence period (corresponding to the grain-filling stage of wheat) by 42.50%. After the parasitoid release, the number of lady beetles slightly decreased, while the number of hoverflies increased. Additionally, the population of another wheat aphid, the bird cherry oat aphid Rhopalosiphum padi, increased slightly in the wasp release fields than in the control, but the difference was not statistically significant. In summary, the artificial release of A. gifuensis effectively overcame the ‘lag effect’ of natural enemies in the fields, enhancing the control efficiency against the grain aphid and reducing its population. The research findings provide significant evidence for the development of biological control strategies targeting the grain aphid and other dominant wheat aphids, as well as for optimizing green pest management techniques.

Key words: winter wheat, artificially release, Sitobion avenea, Rhopalosiphum padi, parasitism rate, aphid decrease rate

CLC Number:

S476.3

JIANG Jun, XU Qingxuan, JIANG Xin, CHENG Yumeng, GU Zihao, ZHANG Yong, LIU Yanxia, QIN Yaoguo, DOU Wei, FAN Jia, CHEN Julian. Effects of Aphidius gifuensis Release on Population Dynamics of Wheat Aphids and its Natural Enemies in Wheat Fields[J]. Chinese Journal of Biological Control, 2025, 41(5): 1018-1026.

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