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.