Effect of temperature and humidity of the fecundity and longevity ofChelonus rufus lyle (Braconidae: Hymenoptera)

  • B. R. Subba Rao
  • G. K. V. Gowda


Chelonus rufus Lyle is an egg larval parasite of the cotton bollwormEarias spp. in India. Investigations on the effect of temperature and humidity on the fecundity and longevity of the parasite have been studied.
  1. (a)

    Temperature has a profound influence on the fecundity, longevity and oviposition days of the parasite.

  2. (b)

    Maximum fecundity is obtained at 30°C., and lower and higher temperatures greatly reduced the number of eggs laid.

  3. (c)

    Optimum temperature for the longevity of the female is 25°C., though there is not significant difference between 25 and 30°C. in this respect. However, at 15°C., the longevity is increased to three times, but the fecundity is very much reduced. At 40°C. the longevity is about four times less than that at optimum temperature.

  4. (d)

    Daylight or darkness do not affect the fecundity.

  5. (e)

    Humidity and the interaction between relative humidity and temperature has no marked effect on both fecundity and longevity of the female.



Potassium Hydroxide Oviposition Rate Oviposition Period Cotton Bollworm Female Parasite 
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Copyright information

© Indian Academy of Sciences 1961

Authors and Affiliations

  • B. R. Subba Rao
    • 1
  • G. K. V. Gowda
    • 1
  1. 1.Division of EntomologyIndian Agricultural Research InstituteNew Delhi

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