Temperature-dependant development and seasonal occurrence of Cabbage armyworm (Mamestra brassicae L.) at Highland Chinese cabbage fields
2005
Kwon, M. (National Institute of Highland Agriculture, RDA, Pyeongchang, Republic of Korea), E-mail: mkwon@rda.go.kr | Kwon, H.J. (National Institute of Highland Agriculture, RDA, Pyeongchang, Republic of Korea) | Lee, S.H. (Seoul National University, Seoul, Republic of Korea)
This study was conducted to investigate the developmental characteristics of cabbage armyworm, Mamestra brassicae L. (Lepidoptera: Noctuidae) by different temperatures and its seasonal occurrence in pepper field. Under four constant temperatures, 15, 20, 22 and 25℃, developmental periods from egg to adult were 88.3, 63.0, 52.3, and 42.8 days, respectively, with egg periods being 9.2, 6.2, 5.0 and 3.9 days, and larval periods being 40.5, 30.1, 23.3 and 21.2 days, respectively. Developmental threshold and thermal requirement in degree-days (DD) were 7.9℃ and 69.4 DD for egg, 4.8℃ and 434.8 DD for larva and 6.7℃ and 344.8 DD for pupa.
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