Effect Of Photoperiod And Temperature On Eclosion And Mating In Hyphantria Cunea

The fall webworm, Hyphantria cunea damages kinds of forests and fruiters, and become a worldwide quarantine pest due to the prolifically fecundity, adaptable capacity and transmission ability. It caused serious economic losses to China, the high environmental adaptability and amazing fecundity are important reasons for it disaster damage. We systematic investigated the effect of photoperiod and temperature on the eclosion and mating, the results are as follows.1. Effect of photoperiod and temperiod on eclosion rhythm of H. cuneaThe eclosion rhythm of H. cunea was investigated under different conditions, the results under LD11:13、LD12、LD13:11、LD14:10、LD15:9and LD16:8at25and28℃revealed that the adults eclosion peak was appeared in the first hour after transferred into darkness and the adults eclosion were more centralized in high temperature. The free-running adults eclosion rhythm was appeared under LL and DD, adults eclosion dispersed though all the24hours and didn’t observe a distinct eclosion peak, these results revealed that the eclosion rhythm is not controlled by endogenous biological clock and only appeared when combined with photoperiod. The results under natural condition further proofed the important role of photoperiod in controlling the adults eclosion rhythm.2. The effects of photoperiod and temperature on protandry in H. cuneaIn insects males emerge before females, being known as protandry; whereas females emerge before males, being known as protogyny. The former is common; the latter is rare. The emergence pattern and the effects of environment conditions on it were investigated under LD18:6and LD16:8at25and28℃in Hyphantria cunea. The results indicated that the H. cunea is a protandry insect species and the emergence pattern was significantly influenced by environment conditions. Otherwise, the protandry was also observed in diapause termination individuals whereas this was only existed in the individuals which were chilled90days but not be chilled120and180days at5℃.3. The effects of photoperiod on mating character of H. cuneaThe effects of photoperiod on mating duration and the effects of mating duration on egg production and hatching rate were investigated in H. cunea. The results indicated that the mating duration was significantly influenced by photoperiod, mating duration increased with the prolonging of photophase, the effects of mating duration on egg production was not significantly, but significantly on hatching rate.