Comparison of cold tolerance and overwintering ability of Spodoptera frugiperda and Mythimna separata in the middle and lower reaches of the Yangtze River in China
Spodoptera frugiperda is an invasive species in China,while Mythimna separata is a native pest,both of them have similar hosts and ecological niches.The differences in cold tolerance between S.frugiperda and M.separata were compared through the indoor cold tolerance test,outdoor overwintering simulation,and field survey in the middle and lower reaches of the Yangtze River in China.These findings provide data support for studying the population competition between invasive and native species.The results showed that the average survival time of M.separata larvae was 4.2-7.2 times longer than that of S.frugiperda at 0 ℃,and 5.7-5.8 times longer at 7 ℃.At 0 ℃,the pupae of S.frugiperda could survive for up to 14 days,and those of M.separata for up to 21 days.At 7 ℃,the pupae of S.frugiperda could survive for up to 28 days,while M.separata pupae could survive for more than 28 days.Surviving M.separata larvae were found in Wuhan in winter after three months of outdoor caging,and no surviving larvae,pupae,or adults of SS.frugiperda were found.During field surveys in several typical areas in the middle and lower reaches of the Yangtze River,overwintering larvae,pupae,or adults of M.separata were found,while no living S.frugiperda were found in the field.The results of simulation tests and field surveys indicated that M.separata could overwinter in the middle and lower reaches of the Yangtze River,while S.frugiperda could not,leading to the possibility that M.separata may emerge earlier than S.frugiperda on the following spring's crops,giving it an advantage in the early stage of competition between the two species.
fall armywormthe oriental armywormoverwintercold tolerancethe middle and lower reaches of the Yangtze Riverinterspecific competition
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