Abstract:
Cumulative effect two abiotic factors temperature (15-35) and relative humidity (50-90%) on longevity and total duration of life cycle of Tetrastichus pyrillae Crawford, one of the important parasite, parasitizing eggs of Pyrilla perpusilla Walker was determined. Influence of temperature both on the longevity and the developmental period of the egg-parasite was highly significant while the relative humidity did not cause any effect. Average longevity of males decreased from 7.06 to 1.58 days and that of females from 12.28 to 1.29 days in response to corresponding rise in test temperature from 15 to 351.5. Mean duration of the life cycle also lined from 40.53 to 8.99 days as the rearing temperature was raised from 15 to 301.5 while no development could take place at or above 32.5.
Page(s):
820-822
DOI:
DOI not available
Published:
Journal: Pakistan Journal of Scientific and Industrial Research, Volume: 32, Issue: 12, Year: 1989