双七瓢虫发育起点温度与有效积温研究

在19、22、25、28、31℃恒温条件下,对双七瓢虫Coccinula quatuordecimpustulata(Linnaeus)]各虫态的发育历期、发育速率、发育起点温度和有效积温进行了研究.结果表明,在19-31℃温度范围内,双七瓢虫各虫态发育速率加快、发育历期随着温度的升高逐渐缩短,在19、22、25、28、31℃温度条件下,卵-蛹期的发育历期分别为32.13、21.59、17.81、13.16 d和11.18 d.试验测得其卵,1～4龄幼虫和蛹的发育起点温度分别为11.47、12.15、12.74、15.02、12.96℃和13.09℃,相应的有效积温分别为39.16、34.06、22.89、21.36、39.93℃和42.41℃.根据有效积温和发育起点温度建立了回归方程和历期预测式.

Study on development threshold temperature and effective accumulative temperature of Coccinella quatuordecimpustulata

Developmental periods,development threshold temperature(DTT),developmental rates and effective accumulative temperature(EAT) of Coccinella quatuordecimpustulata(Linnaeus) were studied under the different condition of 19,22,25,28 ℃ and 31 ℃ in laboratory.The results showed that developmental period of C.quatuordecimpustulata became shorter with temperature increasing,and developmental rates got faster at the temperature range from 19 ℃ to 31 ℃,development period from egg to pupa were 32.13,21.59,17.81,13.16 days and 11.18 days at 19,22,25,28 and 31 ℃,respectively.And DTT of egg,larvae of the 1st to the 4th instar and pupa were 11.47,12.15,12.74,15.02,12.96 ℃ and 13.09 ℃,and their EATs were 39.16,34.06,22.89,21.36,39.93 and 42.41 ℃ respectively.Based on the data of DTT and EAT,Logistic model regression equation and developmental period predicting equations were established.