Diapause regulation in Zygogramma bicolorata (Coleoptera: Chrysomelidae), a biocontrol agent of Parthenium hysterophorus

  • Fazil HasanEmail author
  • M. Shafiq Ansari
  • Mukesh K. Dhillon
  • Mohammad Muslim
  • Amarpal Singh Bhadauriya
  • Aditya Kumar Tanwar
  • Salman Ahmad


Zygogramma bicolorata Pallister is a potential biocontrol agent of Partheniutn hysterophorus L. (Asteraceae). This study was carried out to understand the effect of abiotic (temperature and moisture) and biotic factors (age and reproductive status) on the induction and termination of diapause in Z. bicolorata. We also evaluated the effect of diapause on longevity and fecundity of Z. bicolorata. In Z. bicolorata the induction of diapause occurred between the months of July and December. No diapause was observed in May and June, which coincided with the commencement of the monsoon rains. The percentage of diapause induction in Z. bicolorata was found to increase from one generation to another as well as with the age of adults. Diapause significantly increased the fecundity of females as compared to the fecundity in pre-diapause conditions. Soil moisture (80% RH) played an important role in providing the conditions for initiation and termination of diapause. Similarly, 18.4 and 12.5% of diapause adults resumed their activity in 6 and 5 days when exposed to temperatures of 40° and 45° C for 2 h every day, respectively. Exposure of adults to low temperatures, i.e. 5° and 10° C induced 94.3 and 92.5% diapause, respectively, with no adult mortality. Thus, our findings reveal suitable conditions for preventing and inducing diapause in Z. bicolorata, which is of great importance in the suppression of P. hysterophorus. We discuss the implications of these findings in the control of P. hysterophorus.

Key words

Zygogramma bicolorata environmental factors age sex diapause Parthenium hysterophorus biocontrol 


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Copyright information

© icipe 2018

Authors and Affiliations

  • Fazil Hasan
    • 1
    • 2
    • 3
    Email author
  • M. Shafiq Ansari
    • 1
  • Mukesh K. Dhillon
    • 2
  • Mohammad Muslim
    • 1
  • Amarpal Singh Bhadauriya
    • 2
  • Aditya Kumar Tanwar
    • 2
  • Salman Ahmad
    • 4
  1. 1.Department of Plant Protection, Faculty of Agricultural SciencesAligarh Muslim UniversityAligarhIndia
  2. 2.Division of EntomologyICAR-Indian Agricultural Research InstituteNew DelhiIndia
  3. 3.School of Agricultural SciencesThe Glocal UniversitySaharanpurIndia
  4. 4.Integral Institute of Agricultural Science and TechnologyIntegral UniversityLucknowIndia

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