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Native to Asia, Drosophila suzukii (Matsumura) is currently undergoing a rapid distribution expansion in Europe, America, and parts of Africa and has become a major economic pest of cultivated berry and stone fruits. Understanding the occurrence of D. suzukii and its associated parasitoids in its native range is crucial for effectively manage this invasive pest. In our study, traps baited with sugar vinegar wine were used to monitor the population dynamics of D. suzukii in four waxberry orchards in Fujian province, China, from May 2020 to April 2022. Additionally, parasitoids were sampled using sentinel traps baited with SWD-infested banana from May to June 2022. Four sites survey in Fujian indicated that D. suzukii population peak once per year. This peak occurred either in mid-May or mid-to late June, coinciding with the ripening period of waxberry fruit at the corresponding sites. During the waxberry ripening period, the percentages of D. suzukii adults captured in the four sites were female-bias, and the relative abundance of D. suzukii captured in Fuzhou was greater than that in other sample sites. Moreover, four parasitoid species, namely, Leptopilina japonica Novković & Kimura (Hymenoptera: Figitidae), Pachycrepoideus vindemiae (Rondani) (Hymenoptera: Pteromalidae), Trichopria drosophilae (Perkins) (Hymenoptera: Diapriidae), and Asobara sp. (Hymenoptera: Braconidae) were identified based on morphology. Trichopria drosophilae was numerically dominated in the traps, and it was the only species that emerged from recovered banana slices under laboratory conditions. This study represents the first investigation on the occurrence of D. suzukii and its associated parasitoids in southeastern China. Our findings provide important clues for improving the efficacy of parasitoid-based IPM program in combating this pest, particularly in regions invaded by D. suzukii flies. [ABSTRACT FROM AUTHOR]

In this study we investigated the effects of climate change on the fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae). Based on the current distribution records of S. frugiperda and selected bioclimatic factors, we modelled its potential habitat suitability in China under four climate change scenarios using Maximum Entropy Models (MaxEnt) and Geographic Information Systems (GIS). Our results showed that: (1) the mean area under curve (AUC) values of both our initial and final models were greater than 0.978, indicating high accuracy in the predictions; (2) the dominant environmental factors regulating the habitat suitability of S. frugiperda were Precipitation of Warmest Quarter (bio18), Temperature Seasonality (bio4), Annual Mean Temperature (bio1) and Precipitation Seasonality (bio15); (3) the highly suitable areas for S. frugiperda were mainly distributed in Jiangsu, Anhui, Jiangxi, most parts of Henan and Guangxi, central and eastern Hubei, central and southern Shaanxi, and southeastern and northern Zhejiang, accounting for 17.6% of China’s landmass; (4) from the present until the 2070s, the areas of the non-suitable regions will decrease as climate warming becomes more severe, and the geometric center of the highly and total suitable areas will displace to the north under all four climate change scenarios. [ABSTRACT FROM AUTHOR]