Developmental Threshold Accumulated Temperature Cresson Temperature and Effective of Lysiphlebus testaceipes

摘要

[Objective]The paper was to study the occurrence regularity of Lysiphlebus testaceipes Cresson. [Method]With Aphis craccivora Koch as the breeding host,developmental duration,development threshold temperature and effective accumulative temperature of L. testaceipes Cresson were studied at six constant temperatures of 12,16,20,24,28 and 32℃ in the laboratory,respectively. [Result]The developmental durations of each growth stage of L. testaceipes Cresson were shortened with the increasing temperature ranged from 12 to 32℃,and the growth rate was significantly accelerated with the increasing temperature. However,when the temperature was up to 32℃,the growth and development from mummy to adult was suppressed,and the developmental duration was extended for 0. 45 d than that at 28℃. The developmental durations from egg to adult at 12,16,20,24,28 and 32℃ were 38. 50,21. 25,14. 11,12. 17,10. 28 and 9. 01 d,respectively.The developmental threshold temperatures of egg-mummy,mummy-adult and egg-adult were estimated to be 6. 5,6. 25 and 5. 36℃,respectively; and the effective accumulated temperatures were 136. 28,75. 74 and 227. 23 d·℃,respectively. [Conclusion] Forecast formula of developmental duration and Logistic models were established according to effective accumulated temperature and developmental threshold temperature.