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ISSN : 1225-0171(Print)
ISSN : 2287-545X(Online)
Korean Journal of Applied Entomology Vol.63 No.2 pp.101-107

Understanding the Annual Occurrence Pattern of Delia platura (Diptera: Anthomyiidae): Aestivation and High-temperature Avoiding Hypothesis

Hyeon Suk Jo, Yonggyun Shin, Dong-Soon Kim
Majors in Plant Resource Sciences & Environment, College of Applied Life Science, SARI, Jeju National University, Jeju 63243, Korea


Seedcorn maggot (SDM), Delia platura (Meigen), is a pest in temperate regions and is known to have a very wide host range, including corn, potatoes, and carrots as well as legumes, liliaceae, and cruciferous crops. SDM has a characteristic population abundance in the field, showing decreasing or disappearing after the summer season. This study was conducted to understand the unique annual abundance patterns of SDM. We evaluated the development of SDM under some temperature and photoperiod conditions and surveyed the adult occurrence patterns in the field. Regardless of photoperiod (16L:8D and 12L:12D), SDMs were successfully developed til adults without any aestivation symptoms at 21, 24, and 27°C (pupae survival rate: 93.5-100.0%). Even at a high temperature of 30 and 33°C (16L:8D), aestivation-induced development stages were not observed. Therefore, it was difficult to explain the decline of SDM after summer using the aestivation hypothesis. Field surveys in 2021 and 2022 (Jeju) showed that SDM adults were not caught almost on sticky traps from mid-July. In the 2023 survey at different altitudes, the overall occurrence was low in 620 m traps and did not show any specific annual patterns. Two peaks of SDM were observed at the low altitude of 70 m and the middle altitude of 300 m, and the peaks of 300 m traps in the cooler location appeared delayed by about 40 days compared to those of 70 m. In particular, SDM adults were observed until mid-September after the summer in the 300 m traps. Tentatively, the high-temperature avoiding hypothesis was able to partially explain the later season abundance of SDM. For a more concrete conclusion, it was judged that further studies would be needed on a critical temperature for oviposition, the presence of reproductive diapause (aestivation), and high-temperature avoiding behavior.





Vol. 40 No. 4 (2022.12)

Journal Abbreviation Korean J. Appl. Entomol.
Frequency Quarterly
Doi Prefix 10.5656/KSAE
Year of Launching 1962
Publisher Korean Society of Applied Entomology
Indexed/Tracked/Covered By