Preliminary Studies on the Life Table of the Rice Stem Borer, Chilo suppressalis (Walker) (Lepidoptera: Pyralidae)

Abstract

The typical life table of the rice stem borer in this area was as follows. There were two mortality peaks in the first generation. The first was observed in the lst-instar larvae presumably due to their inability to bore into the stems. The second which involved parasitism, predation and unknown factors, was in the late larval and pupal stages. In the second genaration, there were three low mortality peaks. The first mortality peak was due to predation of eggs and unsuccessful boring of the lst-instar larvae. The cause of the second, which occurred at the intermediate larval stage, was unknown. The third was possibly due to the dispersion of larvae from the sampling plots. © 1977, JAPANESE SOCIETY OF APPLIED ENTOMOLOGY AND ZOOLOGY. All rights reserved.