Quadrastichus erythrinae Kim is currently one of the most dangerous invasive pests in Fujian Province, However, it has the ability potentially to be a dangerous species in the circumpolar latitude area and high altitude area in China.To evaluate cold tolerance of Q.erythrinae, Super-cooling point (SCP) of different stages including larvae, pupae, adults and the total population was measured under low temperature rooms.Then, two logistical models were conducted to fit the relationship between mortality of Q.erythrinae and accumulation of low temperatures, and compared the LSIT50 (median lethal sum of injurious temperature) value of different stages.The results indicated that the average SCP of adults (female and male), pupae and larvae were below-10.0 ℃, respectively (P<0.01), and there was only remarkable difference between females and all other treatments, these pests belonged to type of high tolerance to freeze.The mortality of different stages and the total population increased with the decrease of temperature.More than 80% individuals were dying under 5 ℃, which indicated most individuals did not have the cold tolerance to temperatures under 5 ℃, of which the larvae stage was the strongest cold tolerance.In addition, the correlation between the mortality and accumulation of low temperatures was fitted through 2 kinds of similar logistic model (R2>0.98, P<0.01), and which was used to predict the LSIT50 of different stages and the total population, and the fitted results also showed the order of LSIT50 volues was the larvae, pupae, female adults and male adults respectively.Moreover, the model Ⅱ was better than model Ⅰ because the former was very closer to practical environment, taking ULCIZ into consideration and adding one index into model Ⅱ.All above results will be very helpful to predict their potential biography and analyze their adaptation under the extreme circumstance.
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维普
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